Added code for pv-split

mpi-assign5/pv-split/Aufgabe5.html

+<h1>Aufgabe 5: Parallelisierung Spielsuche</h2>
+<h2>Am Beispiel des Brettspiels Abalone<br>
+HPC-Praktikum SS07</h2>
+<P>
+
+
+<h3>1. Minimax</h3>
+
+Zur Einarbeitung in die f&uuml;r die sp&auml;tere Parallelisierung
+ben&ouml;tigten Codeteile soll zun&auml;chst eine sequentielle
+Minimax-Suchestrategie entwickelt werden. 
+Implementieren sie die Minimax-Suchestrategie f&uuml;r Abalone in einer
+Klasse MinimaxStrategy mit OneLevelStrategy als Vorlage und
+SearchStrategy::_maxDepth als Tiefe, bis zu der Minimax suchen soll;
+Aufrufbeispiele und Details zum Code sind in der README-Datei zum Code
+zu finden.
+<P>
+Welche Leistung (Einheit "Bewertete Stellungen pro Sekunde") erreichen Sie
+bei Nutzung "bester" Compileroptionen auf der Altix
+bei verschiedenen Maximal-Suchtiefen (2,3,4,5) bezogen auf
+<UL>
+<LI>die Anfangsposition des Spiels
+<LI>die Position in "position-midgame1"
+<LI>"position-midgame2" und
+<LI>"position-endgame"?
+</UL>
+Notieren sie sich auch die absolute Anzahl durchgef&uuml;hrter Bewertungen.
+Hinweis: "Bewertungen/s" gibt "player -v ..." aus.
+
+<h3>2. Parallelisierung Minimax</h3>
+
+Parallelisieren Sie die Minimaxsuche entweder mit OpenMP
+(eventuell mit Workqueuing-Konstrukten; siehe Manual des Intel
+Compilers) oder MPI
+mit einer geeigneten Parallelisierungsstrategie
+(f&uuml;r MPI m&uuml;ssen Sie player.c:main() entsprechend ab&auml;ndern).
+<P>
+Welchen Speedup
+bekommen Sie f&uuml;r die in (1) beschriebenen Parameter, also bezogen
+auf der Performance-Wert "Bewertungen/s" f&uuml;r 2,4,6,8 Prozessoren?
+Wann kann der erreichbare Speedup von der aktuellen Stellung abh&auml;ngen?
+
+<P>
+Hinweis:<UL>
+<LI>&Uuml;berlegen Sie, welche Variablen bei der Parallelisierung mit
+OpenMP als privat deklariert werden m&uuml;ssen. Dazu geh&ouml;ren
+bei C++ auch Objekte, die in jedem Thread privat vorhanden sein
+m&uuml;ssen, damit sich die Threads keine Daten &uuml;berschreiben
+(z.B. das Objekt f&uuml;r die Spielposition).
+</UL>
+
+<h3>3. Einfache Parallelisierung Alpha-Beta </h3>
+
+Der vorgegebene Alpha-Beta-Alogrithmus (ABID) l&auml;sst unn&ouml;tige
+Bewertungen aus. Um wieviel Prozent sinkt die absolute Anzahl
+bewerteter Stellungen in den in Teilaufgabe (1) notierten F&auml;llen?
+<P>
+Was w&auml;re eine einfache Parallelisierung des Alpha-Beta-Algorithmus?
+Implementieren Sie Ihre einfache Strategie. Der Suchparallelisierungs-Overhead
+ist der Prozentsatz an unn&ouml;tig durchgef&uuml;hrten Bewertungen. Wie hoch
+ist dieser Overhead in ihrer einfachen Strategie bei 2,3,4,6 Prozessoren und
+den in Teilaufgabe (1) vorgegebenen Stellungen?
+Welche Probleme hat die Parallelisierung ausserdem? Hinweise kann eine
+Speedup-Kurve geben (und bei MPI-Code der Traceanalyzer!).
+
+
+<h3>4. Effiziente Parallelisierung Alpha-Beta</h3>
+
+Um zu einer besseren Parallelisierung zu gelangen, ist eine gut ausbalancierte
+Partitionierung des erwarteten Berechnungsaufwandes wichtig. Man kann davon
+ausgehen, dass der Alpha-Beta Suchbaum mit passender Heuristik der minimalen
+Form sehr nahe kommt. Wie sieht diese aus?
+<I>F&uuml;ndig wird man in "Lu: Parallel
+Search of Narrow Game Trees", siehe HPC-Webseite</I>. In der Arbeit sind
+auch Parallelisierungsstrategien beschrieben.
+Eine wichtige Strategie ist
+PVSplit, die in einem minimalen Alpha-Beta-Suchbaum die Kinder der sogenannten
+ALL-Knoten in einer Tiefensuche parallel behandelt.
+Implementieren Sie PVSplit in OpenMP oder MPI f&uuml;r Abalone.
+Geben Sie entsprechend zu Aufgabe 3 Speedupwerte f&uuml;r ihre
+Parallelisierung von PVSplit an.
+
+
+<P>
+Hinweise:<UL>
+<LI>Bei Nutzung von OpenMP sollten Sie hier Workqueuing-Konstrukte
+einsetzen
+<LI>Welche Bedingung und Codestelle bezeichnet einen ALL-Knoten in PVSplit?
+Genau an diesen Stellen muss parallelisiert werden. 
+</UL>
+
+

mpi-assign5/pv-split/Makefile

+### Compiler
+### Chosen compiler has to be in path (use "module" to setup environment)
+
+# Use this for GCC (warning: GCC < 4.2.x does not support OpenMP)
+#CXX = g++
+
+# Use this for the Intel C++ compiler ("icc" is only the C version)
+#CXX = g++
+
+# Use this for MPI
+CXX = mpiCC
+
+
+### Options
+
+# Useful options for GCC
+#CXXFLAGS=-O3
+#LDFLAGS=
+
+# Useful options for Intel C++
+CXXFLAGS=-O3
+LDFLAGS=
+
+
+LIB_OBJS = move.o board.o network.o search.o eval.o
+SEARCH_OBJS = $(LIB_OBJS) search-abid.o search-onelevel.o search-minimax.o
+#SEARCH_OBJS = $(LIB_OBJS) search-parallel-minimax.o search-parallel-abid.cpp
+
+all: player 
+#start referee
+
+player: player.o $(SEARCH_OBJS)
+	$(CXX) $(CXXFLAGS) $(LDFLAGS) -o $@ $< $(SEARCH_OBJS)
+
+#start: start.o $(LIB_OBJS)
+#	$(CXX) $(CXXFLAGS) $(LDFLAGS) -o $@ $< $(LIB_OBJS)
+
+#referee: referee.o $(LIB_OBJS)
+#	$(CXX) $(CXXFLAGS) $(LDFLAGS) -o $@ $< $(LIB_OBJS)
+
+clean:
+	rm -rf *.o *~ player start referee networktest
+
+networktest: tests/networktest.o network.o
+	$(CXX) -o networktest tests/networktest.o network.o
+
+board.o: board.h board.cpp search.cpp
+move.o: move.h move.cpp
+network.o: network.h network.cpp
+player.o: player.cpp 
+search.o: search.cpp board.cpp move.cpp
+eval.o: eval.cpp board.cpp
+start.o: start.cpp board.cpp move.cpp
+referee.o: referee.cpp board.cpp move.cpp
+search-onelevel.o: search.h board.h eval.h
+search-abid.o: search.h board.h
+search-minimax.o: search.h board.h eval.h
+#search-parallel-minimax.o: search.h board.h eval.h

mpi-assign5/pv-split/README

+Sequentieller Computerspieler fuer Abalone
+==========================================
+
+
+Abalone ist ein Brettspiel der Kategorie "2-Personen-Nullsummen-Spiel
+mit vollstaendiger Information." Dabei bedeutet "Nullsummen-Spiel",
+dass der Vorteil des einen Spielers der Nachteil des anderen ist, und
+"Vollstaendige Information", dass es keine Zufallskomponente gibt.
+Die Regeln gibt es unter
+
+  http://uk.abalonegames.com/rules/basic_rules/official_rules.html
+
+und eine GUI-Version fuer Linux gibt es bei den KDE3 Spielen
+("Kenolaba"). Der "Netwerk-Modus" dieser GUI benutzt denselben
+Kommunikationsbus (siehe unten) wie die Programme hier.
+
+
+Technische Beschreibung
+========================
+
+
+Die Kommunikation zwischen den Spielern basiert auf dem Austausch von
+Spielpositionen auf einem Kommunikationsbus, an den sich mehrere
+Prozesse anschliessen koennen. Auf dem Bus versandte Spielpositionen
+werden an alle angeschlossenen Prozesse weitergeleitet.
+Ein Kommunikationsbus wird identifiziert ueber eine Nummer und einen
+Rechnernamen, auf dem der Kommunikationsbus existiert (die Implementierung
+benutzt fuer den Kommunikationsbus einen TCP-Port auf dem Rechner, der
+frei sein muss; Standard-Busnummer ist 23412).
+
+Bei den folgenden Programmen laesst sich der Kommunikationsbus mit
+Parameter "-p" angeben. Debuginformationen werden mit "-v" oder "-vv"
+(mehr) ausgegeben. Hilfe zu Kommandozeilenoptionen mit "-h".
+Teil der Spielposition ist uebrigens die Zugnummer und eine globale Zeit
+bis zum erzwungenen Ende der Partie in Sekunden (wichtig fuer den
+Turniermodus bei Benutzung eines Schiedsrichters - siehe unten).
+
+
+Programm "player"
+-----------------
+
+Dies ist ein Computerspieler, der eine vorgegebene Farbe spielt, die man
+optional als Argument übergibt. Farben sind entweder "X" oder "O" (Standard).
+Farbe X spielt z.B. das Kommando "player X". Eine Spielstärke als Zahl kann
+in der Kommandozeile als zweites Argument angegeben werden. Wie dieser
+Wert genutzt wird, hängt von der im Computerspieler genutzten Strategie
+ab; bei Spiel auf Zeit beispielsweise ist eine Spielstärke ohne Bedeutung.
+Der Computerspieler schliesst sich einem Kommunikationsbus an
+(Standardbus: "localhost:23412"), und wartet auf Spielpositionen.
+Bekommt er eine Position, in der er spielen soll, berechnet er den besten
+Zug und schickt die resultierende Spielposition an den Bus zurueck.
+
+
+Programm "start"
+----------------
+
+Dieses Programm startet Spiele, beobachtet sie, und beendet sich, wenn
+ein Spieler gewonnen hat. Allerdings kann es keinen Einfluss darauf nehmen,
+wenn ein Spieler betruegt, d.h. Spielpositionen verschickt, die er gar
+nicht erreichen kann, oder bei einem Spiel auf Zeit die verfügbaren
+Zeiten falsch abändert. Gibt man einen Dateinamen als Argument an,
+startet das Spiel an der in der Datei vorgegebenen Position.
+
+
+Programm "referee" ("Schiedsrichter")
+-------------------------------------
+
+Dies hat dieselbe Funktion wie "start", kann aber als Schiedsrichter ein Spiel
+überwachen, indem er das Spiel zwischen 2 Kommunikationsbussen vermittelt.
+Dazu muss auf dem einen Bus ein Spieler fuer "O", und auf dem anderen ein
+Spieler fuer "X" sitzen.
+Der Schiedsrichter verschickt die Startposition (bzw. Position aus einer
+gegebenen Datei) an beide Busse und wartet auf neue Positionen, die er
+nur dann weitergibt an den anderen Bus, wenn sie sich durch einen
+gültigen Zug ergeben. Dabei gibt der Schiedsrichter allein die Zeit vor
+(seit Start des Spiels oder wie in der Datei vorgegeben). Der Schiedsrichter
+entscheidet auch, wann ein Spieler wegen Zeitueberschreitung vorloren hat.
+
+
+
+Aufrufbeispiele
+================
+
+Kompilieren mit "make".
+
+
+
+Ohne Schiedsrichter:
+ player O &
+ player X &
+ start
+
+Mit Schiedsrichter:
+ player -p 3000 O &
+ player -p 4000 X &
+ referee -p 3000 -p 4000
+
+Die Startreihenfolge ist jeweils egal, da "start" and "referee" die
+aktuelle Position an neue Teilnehmer im Kommunikationsbus
+verschicken. Damit kann man Teilnehmer jederzeit abschiessen ('kill'en) und
+neustarten: Sie klinken sich automatisch wieder ein.
+
+Bei einem Spiel auf Zeit startet der Schiedsrichter,
+sobald ein einziger (!) weiterer Teilnehmer existiert.
+
+
+Beispiel fuer Netwerkspiel mit Tunneln
+======================================
+
+Auf Rechner "comp1" soll Spieler O laufen, wird sind auf "mycomp".
+Zwischen mycomp und comp1 ist eine Firewall, die nur SSH erlaubt.
+Auf mycomp soll Spieler X und ein Beobachter/Starter laufen.
+
+Zum Verständnis ist es wichtig zu wissen, dass ein "Kommunikationsbus"
+aus Punkt-zu-Punkt TCP-Verbindungen zwischen allen Teilnehmern eines
+Busses bestehen, wobei jeweils der nächstfreie TCP-Port benutzt wird.
+Beim Start eines Teilnehmers belegt er einen eingehenden Port (LISTEN),
+der der Kanalnummer oder einer nächsthöhrem unbelegten Port entspricht.
+Da ein Spieler auf dem entfernten "comp1" laufen soll, starten wir
+SSH mit einem lokalen Forward auf den entfernten Rechner. Für lokale
+Teilnehmer scheint damit der entfernte Teilnehmer lokal zu existieren.
+Da die 2 lokalen Teilnehmer vom entfernten Rechner aus erreichbar
+sein müssen, müssen 2 weitere Tunnel vom entfernten Rechner auf den
+lokalen Rechner eingerichtet werden ("remote forwards").  
+
+Einloggen auf comp1 (z.B. Kommunikationskanal 5000):
+
+ssh -L 5000:localhost:5000 -R 5001:localhost:5001 -R 5002:localhost:5002 comp1
+comp1> ./player -p 5000 O
+mycomp>./player -p 5000 X &
+mycomp>./start -p 5000
+
+
+
+Implementierung einer eigenen Suchstrategie
+===========================================
+
+Der Code ist in relativ einfachem C++ geschrieben. Für ein zur
+Implementierung einer eigenen Suchstratie ausreichendes Verständnisses
+des Codes sollte es genügen, sich die in "search-onelevel.cpp" implementierte
+Strategie genau anzuschauen. Dieser Code ist dazu ausführlich
+dokumentiert, und zeigt, welche Schritte für eine eigene Suchstrategie
+vorgenommen werden müssen. 
+
+Für eine neue sequentielle Strategie (oder Parallelisierung mit OpenMP)
+reicht es aus, diese Datei als Vorlage zu nehmen. Bei Parallelisierung
+mit MPI muss main() so abgeändert werden, dass "Rank 0" den bisherigen
+Code darin ausführt, und jeder andere MPI-Task in eine zu implementierende
+Funktion springt, die auf Anfragen von Rank 0 wartet (Master-Slave).
+
+"search-onelevel.cpp" ist ein Beispiel einer einfachen Suchstrategie
+mit einer Vorausschau von einem Zug. Im Gegensatz zu dieser einfachen
+Strategie sollte immer eine einstellbare Suchstärke
+berücksichtigt werden, die als "_maxDepth" in SearchStrategy
+erreichbar ist, und über den Kommandozeilenparameter definiert wird.
+Beispiel einer komplexen Suchstrategie (Alpha-Beta mit
+Tiefensuche: "Alpha/Beta with Iterative Deepening") ist in
+search-abid.cpp zu finden.
+
+Die Auswahl einer Suchstrategie erfolgt mit "player -s <Nummer> ...",
+wobei die Zuordnung zwischen der Nummer einer Strategie und ihrem
+Namen in der Hilfe angegeben wird, erreichbar über "player -h".
+

mpi-assign5/pv-split/TODO

+Referee:
+* Protocol extensions:
+  - ...
+
+General:
+* Network: Multiple messages on one TCP connection
+* Network: Real asynch. breaks (really needed?)
+* Gameconsole: Send messages
+

mpi-assign5/pv-split/board.h

+/*
+ * Classes
+ * - Board: represents a game state
+ * - EvalScheme: evaluation scheme
+ *
+ * (c) 1997-2005, Josef Weidendorfer
+*/
+
+#ifndef BOARD_H
+#define BOARD_H
+
+#include "move.h"
+
+class SearchStrategy;
+class Evaluator;
+
+
+/**
+ * Class MoveCounter
+ *
+ * Helper class for board characteristics:
+ * Counter for move types and connectivity
+ * See Board::countFrom().
+ */
+class MoveCounter
+{
+ public:
+  enum InARowType { inARow2 = 0, inARow3, inARow4, inARow5, inARowCount };
+
+  MoveCounter();
+
+  void init();
+  int  moveCount(int t) { return _moveCount[t]; }
+  void incType(int t) { _moveCount[t]++; }
+  int  moveSum();
+  int  rowCount(int r) { return _rowCount[r]; }
+  void incRow(int r) { _rowCount[r]++; }
+
+ private:
+  int _moveCount[Move::typeCount];
+  int _rowCount[inARowCount];
+};
+
+
+
+/**
+ * Board: represents a game state
+ *
+ * Includes methods for
+ * - play/take back moves
+ * - generate allowed moves
+ * - calculate rating for position
+ * - search for best move
+ */
+class Board
+{
+    friend class Evaluator;
+
+ public:
+  Board();
+  ~Board() {};
+
+  /* different states of one field */
+  enum {
+    out = 10, free = 0,
+    color1, color2, color1bright, color2bright
+  };
+  enum { AllFields = 121, /* visible + ring of unvisible around */
+         RealFields = 61, /* number of visible fields */
+         MvsStored = 100 };
+  enum { empty=0, 
+	 valid1,   // valid state with color1 to draw
+	 valid2,   // valid state with color2 to draw
+	 timeout1, // time out for color1 -> win for color2
+	 timeout2, // time out for color2 -> win for color1
+	 win1,     // color1 won
+	 win2,     // color2 won
+	 invalid };
+
+  /* fill Board with defined values */
+  void begin(int startColor);  /* start of a game */
+  void clear();                /* empty board     */
+
+  /* fields can't be changed ! */
+  int operator[](int no) const;
+
+  int actColor() const
+    { return color; }
+
+  /* helper in evaluation: calculate move type counts */
+  void countFrom(int startField, int color, MoveCounter&);
+
+  /* Generate list of allowed moves for player with <color>
+   * Returns a calculated value for actual position */
+  void generateMoves(MoveList& list);
+
+  /* Check if a game position is reachable from the current one.
+   * If <fuzzy> is false, this check includes times and move number.
+   * Returns move which was played. Returns move of type Move::none if not.
+   */
+  Move moveToReach(Board*, bool fuzzy);
+
+  /** Check if another board has same tokens set */
+  bool hasSameFields(Board*);
+
+
+  /* Play the given move.
+   * Played moves can be taken back (<MvsStored> moves are remembered)
+   * Time to play is adjusted if msecs > 0.
+   *
+   * Warning: Only moves that are generated with Board::generateMoves()
+   * should be passed. If the move cannot be played, an assertion is raised.
+   */
+  void playMove(const Move& m, int msecs = 0);
+  bool takeBack();    /* if not remembered, do nothing */
+  int movesStored();  /* return how many moves are remembered */
+
+  Move& lastMove()
+    { return storedMove[storedLast]; }
+
+  void showHist();
+  
+  /* Evaluator to use */
+  void setEvaluator(Evaluator* ev) { _ev = ev; }
+
+  void setActColor(int c) { color=c; }
+  void setColor1Count(int c) { color1Count = c; }
+  void setColor2Count(int c) { color2Count = c; }
+  void setField(int i, int v) { field[i] = v; }
+
+  void setSpyLevel(int);
+
+  int getColor1Count() 	  { return color1Count; }
+  int getColor2Count() 	  { return color2Count; }
+
+  bool isValid() { return (color1Count>8 && color2Count>8); }
+
+  /* Is this position valid, a winner position or invalid? */
+  int validState();
+
+  /* returns a string for the valid state */
+  static char* stateDescription(int);
+
+  /* Check that color1Count & color2Count is consistent with board */
+  bool isConsistent();
+
+  /* Searching best move */
+  void setSearchStrategy(SearchStrategy* ss);
+  void setDepth(int d);
+  Move& bestMove();
+  /* next move in prinipal variation */
+  Move& nextMove();
+
+  Move randomMove();
+  void stopSearch();
+
+  void setMoveNo(int n) { _moveNo = n; }
+  void setMSecsToPlay(int c, int s) { _msecsToPlay[c] = s; }
+  int moveNo() { return _moveNo; }
+  int msecsToPlay(int c) { return _msecsToPlay[c]; }
+
+  /* Readable ASCII representation */
+  char* getState();
+  /* Returns true if new state was set */
+  bool setState(char*);
+
+  void setVerbose(int v) { _verbose = v; }
+
+  void updateSpy(bool b) { bUpdateSpy = b; }
+
+  /* simple terminal view of position */
+  void print();
+
+  static int fieldDiffOfDir(int d) { return direction[d]; }
+
+ private:
+  void setFieldValues();
+
+  /* helper function for generateMoves */
+  void generateFieldMoves(int, MoveList&);
+
+  // random seed
+  int seed;
+
+  int field[AllFields];         /* actual board */
+  int color1Count, color2Count;
+  int color;                    /* actual color */
+  Move storedMove[MvsStored];   /* stored moves */
+  int storedFirst, storedLast;  /* stored in ring puffer manner */
+  int _moveNo;                   /* move number in current game */
+  int _msecsToPlay[3];            /* time in seconds to play */
+
+  bool show, bUpdateSpy;
+
+  int spyLevel, spyDepth;
+  SearchStrategy* _ss;
+  Evaluator* _ev;
+  int _verbose;
+
+  /* constant arrays */
+  static int startBoard[AllFields];
+  static int order[RealFields];
+  static int direction[8];
+
+ public:
+  /* for fast evaluation */
+  int* fieldArray() { return field; }
+};
+
+
+inline int Board::operator[](int no) const
+{
+  return (no<12 || no>120) ? out : field[no];
+}
+
+#endif

mpi-assign5/pv-split/eval.cpp

+/**
+ * EvalScheme and Evaluator
+ */
+
+#include "eval.h"
+
+
+// Default Values
+static int defaultRingValue[] = { 45, 35, 25, 10, 0 };
+static int defaultRingDiff[]  = {  0, 10, 10,  8, 5 };
+static int defaultStoneValue[]= { 0,-800,-1800,-3000,-4400,-6000 };
+static int defaultMoveValue[Move::typeCount] = { 40,30,30, 15,14,13, 
+						 5,5,5, 2,2,2, 1 };
+static int defaultInARowValue[MoveCounter::inARowCount]= { 2, 5, 4, 3 };
+
+
+/**
+ * Constructor: Set Default values
+ */
+EvalScheme::EvalScheme(char* file)
+{
+  setDefaults();
+  read(file);
+}
+
+
+void EvalScheme::setDefaults()
+{
+  for(int i=0;i<6;i++)
+    _stoneValue[i] = defaultStoneValue[i];
+
+  for(int i=0;i<Move::typeCount;i++)
+    _moveValue[i] = defaultMoveValue[i];
+
+  for(int i=0;i<MoveCounter::inARowCount;i++)
+    _inARowValue[i] = defaultInARowValue[i];
+  
+  for(int i=0;i<5;i++)
+    _ringValue[i] = defaultRingValue[i];
+
+  for(int i=0;i<5;i++)
+    _ringDiff[i] = defaultRingDiff[i];
+}
+  
+
+void EvalScheme::read(char* file)
+{
+    if (file == 0 || *file == 0) return;
+
+    // TODO
+}
+
+
+void EvalScheme::save(char* file)
+{
+    // TODO
+}
+
+void EvalScheme::setRingValue(int ring, int value)
+{
+  if (ring >=0 && ring <5)
+      _ringValue[ring] = value;
+}
+
+void EvalScheme::setRingDiff(int ring, int value)
+{
+  if (ring >=1 && ring <5)
+    _ringDiff[ring] = value;
+}
+
+void EvalScheme::setStoneValue(int stoneDiff, int value)
+{
+  if (stoneDiff>0 && stoneDiff<6)
+    _stoneValue[stoneDiff] = value;
+}
+
+void EvalScheme::setMoveValue(int type, int value)
+{
+  if (type>=0 && type<Move::typeCount)
+    _moveValue[type] = value;
+}
+
+void EvalScheme::setInARowValue(int stones, int value)
+{
+  if (stones>=0 && stones<MoveCounter::inARowCount)
+    _inARowValue[stones] = value;
+}
+
+
+
+/// Evaluator
+
+int Evaluator::fieldValue[61];
+
+Evaluator::Evaluator()
+{
+    _evalScheme = 0;
+}
+
+void Evaluator::setEvalScheme(EvalScheme* scheme)
+{
+  if (!scheme)
+    scheme = new EvalScheme(0);
+
+  _evalScheme = scheme;
+  setFieldValues();
+}
+
+void Evaluator::setFieldValues()
+{
+  if (!_evalScheme) return;
+
+  int i, j = 0, k = 59;
+  int ringValue[5], ringDiff[5];
+
+  for(i=0;i<5;i++) {
+    ringDiff[i]  = _evalScheme->ringDiff(i);
+    ringValue[i] = _evalScheme->ringValue(i);
+    if (ringDiff[i]<1) ringDiff[i]=1;
+  }
+
+  fieldValue[0] = ringValue[0];
+  for(i=1;i<7;i++)
+    fieldValue[i] = ringValue[1] + ((j+=k) % ringDiff[1]);
+  for(i=7;i<19;i++)
+    fieldValue[i] = ringValue[2] + ((j+=k) % ringDiff[2]);
+  for(i=19;i<37;i++)
+    fieldValue[i] = ringValue[3] + ((j+=k) % ringDiff[3]);
+  for(i=37;i<61;i++)
+    fieldValue[i] = ringValue[4] + ((j+=k) % ringDiff[4]);
+}
+
+void Evaluator::setBoard(Board* b)
+{
+    _board = b;
+    field = b->fieldArray();
+}
+
+
+
+/* Calculate a evaluation for actual position
+ *
+ * A higher value means a better position for opponent
+ * NB: This means a higher value for better position of
+ *     'color before last move'
+ */
+int Evaluator::calcEvaluation(Board* b)
+{
+    setBoard(b);
+    int color = b->actColor();
+
+    if (!_evalScheme) {
+	// Use default values if not set
+	setEvalScheme();
+    }
+    
+  MoveCounter cColor, cOpponent;
+
+  int f,i,j;
+
+  /* different evaluation types */
+  int fieldValueSum=0, stoneValueSum=0;
+  int moveValueSum=0, inARowValueSum=0;
+  int valueSum;
+
+  /* First check simple winner condition */
+  int color1Count = _board->getColor1Count();
+  int color2Count = _board->getColor2Count();
+  if (color1Count <9)
+    valueSum = (color==color1) ? 16000 : -16000;
+  else if (color2Count <9)
+    valueSum = (color==color2) ? 16000 : -16000;
+  else {
+
+    /* Calculate fieldValueSum and count move types and connectivity */
+    for(i=0;i<RealFields;i++) {
+      j=field[f=Board::order[i]];
+      if (j == free) continue;
+      if (j == color) {
+	b->countFrom( f, j, cColor );
+	fieldValueSum -= fieldValue[i];
+      }
+      else {
+	b->countFrom( f, j, cOpponent );
+	fieldValueSum += fieldValue[i];
+      }
+    }
+
+    /* If color can't do any moves, opponent wins... */
+    if (cColor.moveSum() == 0)
+      valueSum = 16000;
+    else {
+
+      for(int t=0;t < Move::typeCount;t++)
+	moveValueSum += _evalScheme->moveValue(t) *
+	  (cOpponent.moveCount(t) - cColor.moveCount(t));
+
+      for(int i=0;i < MoveCounter::inARowCount;i++)
+	inARowValueSum += _evalScheme->inARowValue(i) *
+	  (cOpponent.rowCount(i) - cColor.rowCount(i));
+
+      if (color == color2)
+	stoneValueSum = _evalScheme->stoneValue(14 - color1Count) -
+	  _evalScheme->stoneValue(14 - color2Count);
+      else
+	stoneValueSum = _evalScheme->stoneValue(14 - color2Count) -
+	  _evalScheme->stoneValue(14 - color1Count);
+
+      valueSum = fieldValueSum + moveValueSum +
+	inARowValueSum + stoneValueSum;
+    }
+  }
+
+#ifdef MYTRACE
+  if (spyLevel>2) {
+    indent(spyDepth);
+    printf("Eval %d (field %d, move %d, inARow %d, stone %d)\n",
+	   valueSum, fieldValueSum, moveValueSum,
+	   inARowValueSum, stoneValueSum );
+  }
+#endif
+
+  return valueSum;
+}
+
+void Evaluator::changeEvaluation()
+{
+  int i,tmp;
+
+  /* innermost ring */
+  tmp=fieldValue[1];
+  for(i=1;i<6;i++)
+    fieldValue[i] = fieldValue[i+1];
+  fieldValue[6] = tmp;
+
+  tmp=fieldValue[7];
+  for(i=7;i<18;i++)
+    fieldValue[i] = fieldValue[i+1];
+  fieldValue[18] = tmp;
+
+  tmp=fieldValue[19];
+  for(i=19;i<36;i++)
+    fieldValue[i] = fieldValue[i+1];
+  fieldValue[36] = tmp;
+
+  /* the outermost ring */
+  tmp=fieldValue[37];
+  for(i=37;i<60;i++)
+    fieldValue[i] = fieldValue[i+1];
+  fieldValue[60] = tmp;
+}

mpi-assign5/pv-split/eval.h

+/**
+ * EvalScheme and Evaluator
+ *
+ * A board evaluation scheme using a combination of 3 evaluations:
+ *  - Token difference
+ *  - Place
+ *  - Movability / Connectivity
+ *
+ * Coefficients used for these evaluations are variable.
+ *
+ * The constructor gets a name, and tries to read the coefficients
+ * from a configuration file, if nothing found, use default values
+ */
+
+
+#ifndef EVAL_H
+#define EVAL_H
+
+#include "board.h"
+
+class EvalScheme
+{
+ public:
+  EvalScheme(char*);
+  ~EvalScheme() {}
+
+  void setDefaults();
+  void read(char* file);
+  void save(char* file);
+
+  void setRingValue(int ring, int value);
+  void setRingDiff(int ring, int value);
+  void setStoneValue(int stoneDiff, int value);
+  void setMoveValue(int type, int value);
+  void setInARowValue(int stones, int value);
+
+  int ringValue(int r) { return (r>=0 && r<5) ? _ringValue[r] : 0; }
+  int ringDiff(int r) { return (r>0 && r<5) ? _ringDiff[r] : 0; }
+  int stoneValue(int s) { return (s>0 && s<6) ? _stoneValue[s] : 0; }
+  int moveValue(int t)
+      { return (t>=0 && t<Move::typeCount) ? _moveValue[t] : 0;}
+  int inARowValue(int s)
+      { return (s>=0 && s<MoveCounter::inARowCount) ? _inARowValue[s]:0; }
+
+ private:
+  int _ringValue[5], _ringDiff[5];
+  int _stoneValue[6], _moveValue[Move::none];
+  int _inARowValue[MoveCounter::inARowCount];
+};
+
+
+class Evaluator
+{
+ public:
+
+    /* different states of one field */
+    enum {
+	out = 10, free = 0,
+	color1, color2, color1bright, color2bright
+    };
+    enum { AllFields = 121, /* visible + ring of unvisible around */
+	   RealFields = 61, /* number of visible fields */
+	   MvsStored = 100 };
+
+    Evaluator();
+
+    /* Evaluation Scheme to use */
+    void setEvalScheme( EvalScheme* scheme = 0);
+    EvalScheme* evalScheme() { return _evalScheme; }
+    void setFieldValues();
+
+    int minValue() { return -15000; }
+    int maxValue() { return  15000; }
+
+    /* Calculate a value for actual position
+     * (greater if better for color1) */
+    int calcEvaluation(Board*);
+
+    /* Evalution is based on values which can be changed
+     * a little (so computer's moves aren't always the same) */
+    void changeEvaluation();
+
+    void setBoard(Board*);
+
+ private:
+    Board* _board;
+    EvalScheme* _evalScheme;
+    int* field;
+
+    /* ratings; semi constant - are rotated by changeRating() */
+    static int fieldValue[Board::RealFields];
+};
+
+#endif

mpi-assign5/pv-split/move.cpp

+/*
+ * Classes
+ * - Move: a move on the game board
+ * - MoveTypeCounter, InARowCounter: evaluation helpers
+ * - MoveList: stores list of moves allowed from a position
+ * - Variation: stores move sequences
+ *
+ * (c) 1997-2005, Josef Weidendorfer
+ */
+
+#include <assert.h>
+#include <stdio.h>
+
+#include "move.h"
+#include "board.h"
+
+
+static const char* nameOfDir(int dir)
+{
+  dir = dir % 6;
+  return 
+    (dir == 1) ? "Right" :
+    (dir == 2) ? "RightDown" :
+    (dir == 3) ? "LeftDown" :
+    (dir == 4) ? "Left" :
+    (dir == 5) ? "LeftUp" :
+    (dir == 0) ? "RightUp" : "??";
+}
+
+static char* nameOfPos(int p)
+{
+  static char tmp[3];
+  tmp[0] = (char)('A' + (p-12)/11);
+  tmp[1] = (char)('1' + (p-12)%11);
+  tmp[2] = 0;
+
+  return tmp;
+}
+
+
+/// Move
+
+char* Move::name() const
+{
+  static char s[30];
+  int pos;
+
+  /* sideway moves... */
+  if (type == left3 || type == right3) {
+    int f1, f2, df;
+    
+    f1 = f2 = field;
+    df = 2* Board::fieldDiffOfDir(direction);
+    if (df > 0)
+      f2 += df;    
+    else
+      f1 += df;
+    
+    pos = sprintf(s, "%s-", nameOfPos( f1 ));
+    const char* dir = (type == left3) ? nameOfDir(direction-1): nameOfDir(direction+1);
+    sprintf(s+pos, "%s/%s", nameOfPos( f2 ), dir);	    
+  }
+  else if ( type == left2 || type == right2) {
+    int f1, f2, df;
+
+    f1 = f2 = field;
+    df = Board::fieldDiffOfDir(direction);
+    if (df > 0)
+      f2 += df;    
+    else
+      f1 += df;
+
+    pos = sprintf(s, "%s-", nameOfPos( f1 ));
+    const char* dir = (type == left2) ? nameOfDir(direction-1): nameOfDir(direction+1);
+    sprintf(s+pos, "%s/%s", nameOfPos( f2 ), dir);
+  }
+  else if (type == none) {
+    return "??";
+  }
+  else {
+    int p = sprintf(s, "%s/%s",
+		    nameOfPos( field ), nameOfDir(direction));
+    
+    if (type<3) sprintf(s+p,"/Out");
+    else if (type<6) sprintf(s+p,"/Push");
+  }
+  return s;
+}
+
+char* Move::typeName() const
+{
+    switch(type) {
+	case out2:       return "Out, pushing 2 opponents with 3";
+	case out1with3:  return "Out, pushing 1 opponent with 3";
+	case out1with2:  return "Out, pushing 1 opponent with 2";
+	case push2:      return "Pushing 2 opponents with 3";
+	case push1with3: return "Pushing 1 opponent with 3";
+	case push1with2: return "Pushing 1 opponent with 2";
+	case move3:      return "Moving 3 in a row";
+	case left3:      return "Moving 3 left sideways";
+	case right3:     return "Moving 3 right sideways";
+	case left2:      return "Moving 2 left sideways";
+	case right2:     return "Moving 2 right sideways";
+	case move2:      return "Moving 2 in a row";
+	case move1:      return "Moving 1";
+	default:
+	    break;
+    }
+    return "Invalid type";
+}
+
+void Move::print() const
+{
+  printf("%s", name() );
+}
+
+
+
+
+/// MoveList
+
+MoveList::MoveList()
+{
+	clear();
+}
+
+void MoveList::clear()
+{
+	int i;
+	
+	for(i=0;i<Move::typeCount;i++)
+		first[i] = actual[i] = -1;
+	
+	nextUnused = 0;
+	actualType = -1;
+}
+
+void MoveList::insert(Move m)
+{
+	int t = m.type;
+	
+	/* valid and possible ? */
+	if (t <0 || t >= Move::typeCount) return;
+	//if (nextUnused == MaxMoves) return;
+
+	assert( nextUnused < MaxMoves );
+
+	/* adjust queue */
+	if (first[t] == -1) {
+		first[t] = last[t] = nextUnused;
+	}
+	else {
+	        assert( last[t] < nextUnused );
+		next[last[t]] = nextUnused;
+		last[t] = nextUnused;
+	}
+	
+	next[nextUnused] = -1;	
+	move[nextUnused] = m;
+	nextUnused++;
+}
+
+bool MoveList::isElement(int f)
+{
+	int i;
+	
+	for(i=0; i<nextUnused; i++) 
+	  if (move[i].field == f) 
+		return true;
+
+	return false;
+}
+
+
+bool MoveList::isElement(Move &m, int startType, bool del)
+{
+	int i;
+	
+	for(i=0; i<nextUnused; i++) {
+	  Move& mm = move[i];
+	  if (mm.field != m.field) 
+	    continue;
+
+	  /* if direction is supplied it has to match */
+	  if ((m.direction > 0) && (mm.direction != m.direction))
+	    continue;
+
+	  /* if type is supplied it has to match */	    
+	  if ((m.type != Move::none) && (m.type != mm.type))
+	    continue;
+				      
+	  if (m.type == mm.type) {
+	    /* exact match; eventually supply direction */
+	    m.direction = mm.direction;
+	    if (del) mm.type = Move::none;
+	    return true;
+	  }
+
+	  switch(mm.type) {
+	  case Move::left3:
+	  case Move::right3:
+	    if (startType == start3 || startType == all) {
+	      m.type = mm.type;
+	      m.direction = mm.direction;
+	      if (del) mm.type = Move::none;
+	      return true;
+	    }
+	    break;
+	  case Move::left2:
+	  case Move::right2:
+	    if (startType == start2 || startType == all) {
+	      m.type = mm.type;
+	      m.direction = mm.direction;
+	      if (del) mm.type = Move::none;
+	      return true;
+	    }
+	    break;
+	  default:
+	    if (startType == start1 || startType == all) {
+	      /* unexact match: supply type */
+	      m.type = mm.type;
+	      m.direction = mm.direction;
+	      if (del) mm.type = Move::none;
+	      return true;
+	    }
+	  }
+	}
+	return false;
+}
+
+
+bool MoveList::getNext(Move& m, int maxType)
+{
+	if (actualType == Move::typeCount) return false;
+
+	while(1) {
+	  while(actualType < 0 || actual[actualType] == -1) {
+	    actualType++;
+	    if (actualType == Move::typeCount) return false;
+	    actual[actualType] = first[actualType];
+	    if (actualType > maxType) return false;
+	  }
+	  m = move[actual[actualType]];
+	  actual[actualType] = next[actual[actualType]];
+	  if (m.type != Move::none) break;
+	}
+
+	return true;
+}
+
+int MoveList::count(int maxType)
+{
+    int c = 0;
+    int type = actualType;    
+    int act = 0;
+    if (type>=0) act = actual[type];
+
+    while(1) {
+	while(type < 0 || act == -1) {
+	    type++;
+	    if (type == Move::typeCount) return c;
+	    act = first[type];
+	    if (type > maxType) return c;
+	}
+	c++;
+	act = next[act];
+    }
+    return c;
+}
+
+/// Variation
+
+void Variation::clear(int d)
+{
+  int i,j;
+
+  for(i=0;i<maxDepth;i++)
+    for(j=0;j<maxDepth;j++) {
+      move[i][j].type = Move::none;
+    }
+  actMaxDepth = (d<maxDepth) ? d:maxDepth-1;
+}
+
+void Variation::update(int d, Move& m)
+{
+  int i;
+  
+  if (d>actMaxDepth) return;
+  for(i=d+1;i<=actMaxDepth;i++) {
+    move[d][i]=move[d+1][i];
+    move[d+1][i].type = Move::none;
+  }
+  move[d][d]=m;
+}

mpi-assign5/pv-split/move.h

+/*
+ * Classes
+ * - Move: a move on the game board
+ * - MoveTypeCounter, InARowCounter: evaluation helpers
+ * - MoveList: stores list of moves allowed from a position
+ * - Variation: stores move sequences
+ *
+ * (c) 1997-2005, Josef Weidendorfer
+ */
+
+#ifndef MOVE_H
+#define MOVE_H
+
+/**
+ * Class Move
+ *
+ * A move on the game board.
+ * A move is given by a start position number on the board
+ * (for board numbering, see board.h), a direction (out of 6),
+ * and the type of the move. Type includes the number of own
+ * and opponents tokens taken part in the move, and side-way
+ * moves.
+ */
+class Move
+{
+ public:
+
+  /* Directions */
+  enum { Right=1, RightDown, LeftDown, Left, LeftUp, RightUp };
+
+  /* Type of move: Moves are searched in this order */
+  enum MoveType { out2 = 0, out1with3, out1with2, push2,
+		  push1with3, push1with2, move3, left3, right3,
+		  left2, right2, move2, move1, none };
+  /* Constants to specify move type ranges. For this to work,
+   * the enum order in MoveType must not be changed!
+   */
+  enum { typeCount = none,
+	 maxOutType = out1with2,
+	 maxPushType = push1with2,
+	 maxMoveType = move1 };
+
+  /* Constructor for an invalid move */
+  Move() { type = none; field = 0; direction = 0; }
+  /* Move starting at f, direction d, and Type t */
+  Move(short f, char d, MoveType t)
+    { field = f; direction = d, type = t; }		
+	
+  /* Does this move push out an opponents token? */
+  bool isOutMove() const { return type <= out1with2; }
+
+  /* Does this move push opponent tokens? */
+  bool isPushMove() const { return type <= push1with2; }
+
+  /* for communication to outer world */
+  char* name() const;
+  char* typeName() const;
+  /* debugging output */
+  void print() const;
+
+  /* Allow public R/W access... */
+  short field;
+  unsigned char direction;
+  MoveType type;
+};
+
+
+/**
+ * Class MoveList
+ *
+ * Stores a fixed number of moves (for efficince) 
+ * <getNext> returns reference of next move ordered according to type
+ * <insert> does nothing if there isn't enough free space
+ * 
+ * Recommend usage (* means 0 or more times):
+ *   [ clear() ; insert() * ; isElement() * ; getNext() * ] *
+ */
+class MoveList
+{
+ public:
+	MoveList();
+	
+	enum { MaxMoves = 150 };
+
+	/* for isElement: search for moves starting with 1/2/3 fields */
+	enum { all , start1, start2, start3 };
+		
+	void clear();
+	void insert(Move);
+	bool isElement(int f);
+	bool isElement(Move&, int startType, bool del=false);
+	void insert(short f, char d, Move::MoveType t)
+	  { insert( Move(f,d,t) ); }
+	int getLength()
+	  { return nextUnused; }
+	int count(int maxType = Move::typeCount);
+		  
+	/**
+	 * Get next move from the list into the Move instance
+	 * given by first arg which is passed by reference.
+	 *
+	 * Move types are sorted, and you can specify the maximal
+	 * type allowed to be returned. Default is to return all moves.
+	 *
+	 * Return false if no more moves (with given type constrain)
+	 */
+	bool getNext(Move&, int maxType = Move::none);
+
+ private:
+	Move move[MaxMoves];
+	int  next[MaxMoves];
+	int  first[Move::typeCount];
+	int  last[Move::typeCount];
+	int  actual[Move::typeCount];
+	int  nextUnused, actualType;
+};
+
+
+/**
+ * Stores best move sequence = principal variation
+ *
+ * Implementation uses upper left triangle of a matrix,
+ * with row 0 holding best sequence found so far from
+ * real current game position, row 1 holding best sequence
+ * starting from currently searched depth 1 in game tree,
+ * row 2 from depth 2 and so on.
+ *
+ * Uses:
+ * - A new best move sequence at search depth d was found.
+ *   copy current move of depth d into [d][0], and the rest from row d+1.
+ * - Read principal variation on starting a new alpha/beta search.
+ *   This heuristic is assumed to lead to a lot of cutoffs happening.
+ * - Read finally found best move from [0][0]
+ * - Allow for computer hints to the opponent by looking at [0][1]
+ */
+class Variation
+{
+ public:
+  enum { maxDepth = 10 };
+
+  Variation() { clear(1); }
+
+  /* Does the best sequence have a move for depth d ? */
+  bool hasMove(int d)
+    {  return (d>actMaxDepth) ?
+	 false : (move[0][d].type != Move::none); }
+
+  /* Get move at index i from best move chain */
+  Move& operator[](int i)
+    { return (i<0 || i>=maxDepth) ? move[0][0] : move[0][i]; }
+
+  /* Get move chain at depth d */
+  Move* chain(int d)
+      { return (d<0 || d>=maxDepth) ? &(move[0][0]) : &(move[d][d]); }
+
+  /* Update best move from depth d, starting with move m at this depth */
+  void update(int d, Move& m);
+
+  /* Clear sequence storage for moves from depth d */
+  void clear(int d);
+
+  /* Set maximum supported depth */
+  void setMaxDepth(int d)
+    { actMaxDepth = (d>maxDepth) ? maxDepth-1 : d; }
+
+ private:
+  Move move[maxDepth][maxDepth];
+  int actMaxDepth;
+};
+
+
+#endif /* _MOVE_H_ */
+

mpi-assign5/pv-split/network.h

+/*
+ * Simple Network Communication via event-driven loop
+ *
+ * (C) 2005, Josef Weidendorfer
+ *
+ * Install a communication domain which is a listening socket
+ * on a port and a set of remote connection to this port.
+ * You can register callbacks for incoming ASCII data on
+ * communcation domains and broadcast your own data into a domain.
+ */
+
+#ifndef NETWORK_H
+#define NETWORK_H
+
+#include <sys/types.h>
+#include <netinet/in.h>
+
+class NetworkDomain;
+class NetworkTimer;
+
+/**
+ * Event loop for network communication
+ */
+class NetworkLoop
+{
+ public:
+    NetworkLoop();
+
+    /**
+     * Install a listening socket on the port given by the NetworkDomain.
+     * Incoming connections are accepted, and incoming
+     * data will lead to callbacks specified in the NetworkDomain.
+     * Returns true if successfull.
+     */
+    bool install(NetworkDomain*);
+
+    /**
+     * Install a oneshot timer object. Install the timer again in
+     * timeout() for regular calls.
+     */
+    bool install(NetworkTimer*);
+
+    /**
+     * Remove a NetworkDomain. Existing connections will be closed.
+     */
+    void remove(NetworkDomain*);
+
+    /**
+     * Blocks in a select() on network connections and
+     * calls registered callbacks on incoming data.
+     * Call exit() to leave the event loop with given exit value.
+     */
+    int run();
+
+    /**
+     * While running inside of a event loop via run(),
+     * call this function the trigger quitting the loop, i.e.
+     * returning from run().
+     */
+    void exit(int value = 1);
+
+    /**
+     * Are incoming data pending?
+     */
+    bool pending();
+
+    /**
+     * Process pending data
+     */
+    void processPending();
+
+
+ private:
+    NetworkDomain* domainList;
+    NetworkTimer* timerList;
+    bool exit_loop;
+    int exit_value;
+
+    /* Set of file descriptors used in select.
+     * This includes listening and data sockets
+     */
+    fd_set readfds;
+    int max_readfd;
+};
+
+
+/**
+ * A timer to be used with NetworkLoop.
+ *
+ * Install an instance into the loop to get timeout() called
+ * after <secs> seconds.
+ */
+class NetworkTimer
+{
+ public:
+    NetworkTimer(int msecs);
+    virtual ~NetworkTimer() {}
+
+    int msecs() { return _msecs; }
+
+    virtual void timeout(NetworkLoop*);
+
+    /**
+     * Internal.
+     * Helpers for NetworkLoop
+     */    
+    void reset();
+    void set(struct timeval*);
+    void minLeft(struct timeval*);
+    bool subLeft(struct timeval*);
+
+    NetworkTimer* next;
+
+ private:
+    int _msecs;
+    struct timeval _left;
+};
+
+/** 
+ * An active connection in a communication domain
+ */
+class Connection {
+ public:
+    Connection(NetworkDomain*, Connection*,
+	       const char*, int,
+	       struct sockaddr_in, bool);
+  
+    ~Connection();
+
+    void setHost(const char* h);
+    
+    /**
+     * Send a string to this connection.
+     */
+    bool sendString(const char* str, int len);
+
+    /* Get string for remote end */
+    char* addr();
+
+    /**
+     * Internal.
+     * Called from NetworkDomain to send registration string
+     */
+    bool start();
+
+  
+    char host[100];
+    int port;
+    struct sockaddr_in sin;
+    bool reachable;
+
+    NetworkDomain* domain;
+    Connection* next;
+};
+
+
+/**
+ * The Network domainclass can be subclassed to send and to
+ * receive multicasts from other Network instances in
+ * other processes/machines.
+ */
+class NetworkDomain
+{
+ public:
+  enum { defaultPort = 23412 };
+
+  /* install listening TCP socket on port */
+  NetworkDomain(int port = defaultPort);
+  virtual ~NetworkDomain();
+
+  bool isListening() { return (fd>=0); }
+
+  /**
+   * Returns the file descriptor for the listening socket
+   */
+  int startListening(NetworkLoop*);
+
+  /**
+   * Close all connections and listening socket
+   */
+  void close();
+
+  int ID() { return myID; }
+  int listeningPort() { return myPort; }
+  int listeningFD() { return fd; }
+  void addConnection(const char* host, int port);  
+  void broadcast(const char* str);
+
+  /* return number of connections */
+  int count();
+
+  /* For list of domains used in a NetworkLoop.
+   * Can be done this way as a NetworkDomain can only be used
+   * in one NetworkLoop at a time
+   */
+  NetworkDomain* next;
+
+  /**
+   * Internal use.
+   * NetworkLoop asks to check for pending connections and data
+   */
+  void check(fd_set*);
+
+  /**
+   * Internal use.
+   * Overwrite this to react on new connections
+   */
+  virtual void newConnection(Connection*);
+
+ protected:
+  /* overwrite this in your subclass to receive
+   * strings broadcasted */
+  virtual void received(char* str);
+  Connection* prepareConnection(const char* host, int port);  
+
+ private:
+  void gotConnection();
+  /* factory for connections to not get multiply connections to one target */
+  Connection* getNewConnection(const char* h, struct sockaddr_in sin);
+
+  NetworkLoop* loop;
+  Connection* connectionList;
+  struct sockaddr_in mySin;
+  int fd, myID, myPort;
+};
+
+#endif
+
+  

mpi-assign5/pv-split/player.cpp

+/**
+ * Computer player
+ *
+ * (1) Connects to a game communication channel,
+ * (2) Waits for a game position requiring to draw a move,
+ * (3) Does a best move search, and broadcasts the resulting position,
+ *     Jump to (2)
+ *
+ * (C) 2005, Josef Weidendorfer
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/time.h>
+#include <mpi.h>
+
+#include "board.h"
+#include "search.h"
+#include "eval.h"
+#include "network.h"
+
+#define pretty_print(name, val) printf("%s = %d: %s: %s: %d\n", name, val,  __FILE__,__FUNCTION__,__LINE__);
+
+
+int thread_rank;
+int num_threads;
+
+FILE *file;
+
+/* Global, static vars */
+NetworkLoop l;
+Board b;
+Evaluator ev;
+
+/* Which color to play? */
+int myColor = Board::color1;
+
+/* Which search strategy to use? */
+int strategyNo = 0;
+
+/* Max search depth */
+int maxDepth = 0;
+
+/* Maximal number of moves before terminating (negative for infinity) */
+int maxMoves = -1;
+
+/* to set verbosity of NetworkLoop implementation */
+extern int verbose;
+
+/* remote channel */
+char* host = 0;       /* not used on default */
+int rport = 23412;
+
+/* local channel */
+int lport = 13133;
+
+/* change evaluation after move? */
+bool changeEval = true;
+
+char global_tmp[500];
+
+
+/**
+ * MyDomain
+ *
+ * Class for communication handling for player:
+ * - start search for best move if a position is received
+ *   in which this player is about to draw
+ */
+class MyDomain: public NetworkDomain
+{
+	public:
+		MyDomain(int p) : NetworkDomain(p) {}
+
+		void sendBoard();
+
+//	protected:
+		void received(char* str);
+};
+
+void MyDomain::sendBoard()
+{
+	static char tmp[500];
+	sprintf(tmp, "pos %s\n", b.getState());
+	if (verbose) printf(tmp+4);
+	broadcast(tmp);
+}
+
+void MyDomain::received(char* str)
+{
+
+	if (strncmp(str, "quit", 4)==0) {
+		l.exit();
+		return;
+	}
+
+	if (strncmp(str, "pos ", 4)!=0) return;
+
+	b.setState(str+4);
+	if (verbose) {
+		printf("\n\n==========================================\n");
+		printf(str+4);
+	}
+
+	int state = b.validState();
+	if ((state != Board::valid1) && 
+			(state != Board::valid2)) {
+		printf("%s\n", Board::stateDescription(state));
+		switch(state) {
+			case Board::timeout1:
+			case Board::timeout2:
+			case Board::win1:
+			case Board::win2:
+				l.exit();
+			default:
+				break;
+		}
+		return;
+	}
+
+	if (b.actColor() & myColor) {
+		struct timeval t1, t2;
+
+		gettimeofday(&t1,0);
+		Move m = b.bestMove();
+		gettimeofday(&t2,0);
+
+		int msecsPassed =
+			(1000* t2.tv_sec + t2.tv_usec / 1000) -
+			(1000* t1.tv_sec + t1.tv_usec / 1000);
+
+		printf("%s ", (myColor == Board::color1) ? "O":"X");
+		if (m.type == Move::none) {
+			printf(" can not draw any move ?! Sorry.\n");
+			return;
+		}
+		printf("draws '%s' (after %d.%03d secs)...\n",
+				m.name(), msecsPassed/1000, msecsPassed%1000);
+
+		b.playMove(m, msecsPassed);
+		sendBoard();
+
+		if (changeEval)
+			ev.changeEvaluation();
+
+		/* stop player at win position */
+		int state = b.validState();
+		if ((state != Board::valid1) && 
+				(state != Board::valid2)) {
+			printf("%s\n", Board::stateDescription(state));
+			switch(state) {
+				case Board::timeout1:
+				case Board::timeout2:
+				case Board::win1:
+				case Board::win2:
+					l.exit();
+				default:
+					break;
+			}
+		}
+
+		maxMoves--;
+		if (maxMoves == 0) {
+			printf("Terminating because given number of moves drawn.\n");
+			broadcast("quit\n");
+			l.exit();
+		}
+	}    
+}
+
+
+
+/*
+ * Main program
+ */
+
+void printHelp(char* prg, bool printHeader)
+{
+	if (printHeader)
+		printf("Computer player V 0.1 - (C) 2005 Josef Weidendorfer\n"
+				"Search for a move on receiving a position in which we are expected to draw.\n\n");
+
+	printf("Usage: %s [options] [X|O] [<strength>]\n\n"
+			"  X                Play side X\n"
+			"  O                Play side O (default)\n"
+			"  <strength>       Playing strength, depending on strategy\n"
+			"                   A time limit can reduce this\n\n" ,
+			prg);
+	printf(" Options:\n"
+			"  -h / --help      Print this help text\n"
+			"  -v / -vv         Be verbose / more verbose\n"
+			"  -s <strategy>    Number of strategy to use for computer (see below)\n"
+			"  -n               Do not change evaluation function after own moves\n"
+			" -<integer>        Maximal number of moves before terminating\n"
+			"  -p [host:][port] Connection to broadcast channel\n"
+			"                   (default: 23412)\n\n");
+
+	printf(" Available search strategies for option '-s':\n");
+
+	char** strs = SearchStrategy::strategies();
+	for(int i = 0; strs[i]; i++)
+		printf("  %2d : Strategy '%s'%s\n", i, strs[i],
+				(i==strategyNo) ? " (default)":"");
+	printf("\n");
+
+	exit(1);
+}
+
+void parseArgs(int argc, char* argv[])
+{
+	int arg=0;
+	while(arg+1<argc) {
+		arg++;
+		if (strcmp(argv[arg],"-h")==0 ||
+				strcmp(argv[arg],"--help")==0) printHelp(argv[0], true);
+		if (strncmp(argv[arg],"-v",2)==0) {   
+			verbose = 1;
+			while(argv[arg][verbose+1] == 'v') verbose++;
+			continue;
+		}
+		if (strcmp(argv[arg],"-n")==0)	{
+			changeEval = false;
+			continue;
+		}
+		if ((strcmp(argv[arg],"-s")==0) && (arg+1<argc)) {
+			arg++;
+			if (argv[arg][0]>='0' && argv[arg][0]<='9')
+				strategyNo = argv[arg][0] - '0';
+			continue;
+		}
+
+		if ((argv[arg][0] == '-') &&
+				(argv[arg][1] >= '0') &&
+				(argv[arg][1] <= '9')) {
+			int pos = 2;
+
+			maxMoves = argv[arg][1] - '0';
+			while((argv[arg][pos] >= '0') &&
+					(argv[arg][pos] <= '9')) {
+				maxMoves = maxMoves * 10 + argv[arg][pos] - '0';
+				pos++;
+			}
+			continue;
+		}
+
+		if ((strcmp(argv[arg],"-p")==0) && (arg+1<argc)) {
+			arg++;
+			if (argv[arg][0]>'0' && argv[arg][0]<='9') {
+				lport = atoi(argv[arg]);
+				continue;
+			}
+			char* c = strrchr(argv[arg],':');
+			int p = 0;
+			if (c != 0) {
+				*c = 0;
+				p = atoi(c+1);
+			}
+			host = argv[arg];
+			if (p) rport = p;
+			continue;
+		}
+
+		if ((strcmp(argv[arg],"-f")==0) && (arg+1<argc)) {
+			arg++;
+			file = fopen(argv[arg], "r");
+			//arg++;
+			continue;
+		}
+
+		if (argv[arg][0] == 'X') {
+			myColor = Board::color2;
+			continue; 
+		}
+		if (argv[arg][0] == 'O') {
+			myColor = Board::color1;
+			continue;
+		}
+
+		int strength = atoi(argv[arg]);
+		if (strength == 0) {
+			printf("ERROR - Unknown option %s\n", argv[arg]);
+			printHelp(argv[0], false);
+		}
+
+		maxDepth = strength;
+	}
+}
+
+extern int avg_kleavesPerSec;
+extern int _msecs;
+
+
+Move m;
+int main(int argc, char* argv[])
+{
+
+	MPI_Init(&argc, &argv);
+
+	MPI_Comm_size(MPI_COMM_WORLD, &num_threads);
+	MPI_Comm_rank(MPI_COMM_WORLD, &thread_rank);
+
+	parseArgs(argc, argv);
+
+	if (file){
+		int len = 0, c;
+		while( len<499 && (c=fgetc(file)) != EOF)
+			global_tmp[len++] = (char) c;
+		global_tmp[len++]=0;
+
+		//printf("Gaurav\n");
+		//printf("%s",global_tmp);
+		//printf("Gaurav\n");
+	}
+
+	SearchStrategy* ss = SearchStrategy::create(strategyNo);
+	if (verbose)
+		printf("Using strategy '%s' ...\n", ss->name());
+	ss->setMaxDepth(maxDepth);
+
+	b.setSearchStrategy( ss );
+	ss->setEvaluator(&ev);
+	ss->registerCallbacks(new SearchCallbacks(verbose));
+
+	if(thread_rank == 0) {
+
+		MyDomain d(lport);
+		d.received(global_tmp);
+
+		// Send a signal to the slaves, that they should quit
+		Slave_Input slave_input;
+		slave_input.depth = -1;
+		int slave_id;
+		for (slave_id = 0; slave_id < num_threads-1; slave_id++)
+			MPI_Send(&slave_input, sizeof(Slave_Input), MPI_BYTE, slave_id + 1, 10, MPI_COMM_WORLD);
+
+		//printf("Average leaves visited per sec  = %d k/s\n", avg_kleavesPerSec);
+	}
+	else
+	{
+		while (1)
+		{
+			MPI_Status mpi_st;
+			Slave_Input slave_input;
+			Slave_Output slave_output;
+			MPI_Recv (&slave_input, sizeof(Slave_Input), MPI_BYTE, 0, 10, MPI_COMM_WORLD, &mpi_st);
+			// depth= -1 is a signal for the slave to quit
+			if (slave_input.depth == -1)
+				break;
+
+			ss->_board = &b;
+			ss->_board->setState(slave_input.boardstate);
+			ss->_board->playMove(slave_input.move);
+			((ABIDStrategy*)ss)->_currentMaxDepth = slave_input.currentMaxDepth;
+			ss->_sc->_leavesVisited = 0;
+			ss->_sc->_nodesVisited = 0;
+			/* check for a win position first */
+			if (!ss->_board->isValid()) 
+			{
+	    			slave_output.eval = (14999-(slave_input.depth-1));
+			}
+			else
+			{
+				if ((slave_input.depth == slave_input.currentMaxDepth) && (slave_input.move.type > Move::maxPushType ))
+					slave_output.eval = ss->evaluate();
+				else				
+					slave_output.eval = -((ABIDStrategy*)ss)->alphabeta(slave_input.depth, slave_input.alpha, slave_input.beta);
+			}
+			((ABIDStrategy*)ss)->_pv.update(slave_input.depth-1, slave_input.move);
+
+			slave_output.pv = ((ABIDStrategy*)ss)->_pv;
+			slave_output.num_leaves = ss->_sc->_leavesVisited;
+			slave_output.num_nodes = ss->_sc->_nodesVisited;
+			MPI_Send(&slave_output, sizeof(Slave_Output), MPI_BYTE, 0, 10, MPI_COMM_WORLD);
+		}
+	}
+	/*
+	int *avg_list;
+
+
+	avg_list = (int*)malloc(sizeof(int)*num_threads);
+
+	MPI_Gather (&avg_kleavesPerSec, 1, MPI_INT,
+			avg_list, 1, MPI_INT, 0, MPI_COMM_WORLD);
+
+	if(thread_rank == 0)
+	{
+		int average;
+		for(int i=0;i<num_threads;i++) {
+			average += avg_list[i];
+		}
+	
+		printf("\n\n\n%d, %d, %d, %f, %s\n", num_threads, maxDepth, average, _msecs/1000.0,  ss->_bestMove.name());
+
+	}*/
+	MPI_Finalize();
+
+}

mpi-assign5/pv-split/position-endgame

+pos #69  O: 14,  X: 10
+       -----------
+      / . . . . . \
+     / . O . . . . \
+    / . . O . . . . \
+   / . . X . O . . . \
+  | . X X O O O O . . |
+   \ . X . O O O . . /
+    \ . O O O O . . /
+     \ . X X X X . /
+      \ . . X . X /
+       -----------
+
+
+X about to move...
+
+=========================================================
+Start from this position with
+
+       ./start position-endgame
+
+Results for "./player <Strength> X"
+(Sequential search, Pentium M, 1.6 GHz)
+
+ Strength |    Move     |  Evaluated  | Time [s] | Rate
+          |             |             |  -O3     | [Evals/s]
+    1       I9/RightUp           384
+    2       I7/LeftUp/Psh      1 796       .042     43 k
+    3       I7/LeftUp/Psh     17 823       .169    105 k
+    4       I7/LeftUp/Psh     23 266       .255     91 k
+    5       I7/LeftUp/Psh  1 520 313      5.715    266 k
+    6       I7/LeftUp/Psh 11 196 668     39.575    283 k

mpi-assign5/pv-split/position-midgame1

+pos #29  O: 14,  X: 14
+       -----------
+      / . . . . . \
+     / . O O O O . \
+    / . O O . O . . \
+   / . . O O O . . . \
+  | . . O O O . . . . |
+   \ . X O X X X . . /
+    \ . X X X X X . /
+     \ X X X X X . /
+      \ . . . . . /
+       -----------
+
+X about to move...
+
+=========================================================
+Start from this position with
+
+       ./start position-midgame1
+
+Results for "./player <Strength> X"
+(Sequential search, Pentium M, 1.6 GHz)
+
+ Strength |    Move     |  Evaluated  | Time [s] | Rate
+          |             |             |  -O3     | [Evals/s]
+    1       F3/LeftDown           71
+    2       F3-G4/Left         5 199       .064     81 k
+    3       F3-G4/Left       120 718       .649    186 k
+    4       G4/LeftUp      2 485 542     11.067    225 k
+    5       G4/RightDown  15 018 100     70.446    213 k

mpi-assign5/pv-split/position-midgame2

+pos #120  O: 14,  X: 12
+       -----------
+      / . . . . . \
+     / O O O O O . \
+    / . O O X O . . \
+   / . O X O O . . . \
+  | . O O X X X . . . |
+   \ . . O X X X . . /
+    \ . . X . X . . /
+     \ . X . X . . /
+      \ . . . . . /
+       -----------
+
+
+O about to move...
+
+=========================================================
+Start from this position with
+
+       ./start position-midgame2
+
+Results for "./player <Strength> O"
+(Sequential search, Pentium M, 1.6 GHz)
+
+ Strength |    Move     |  Evaluated  | Time [s] | Rate
+          |             |             |  -O3     | [Evals/s]
+    1       E3-F4/LeftDown       257
+    2       B1/RightUp         4 358       .062     70 k
+    3       C2-E2/Left        97 908       .505    194 k
+    4       B1/LeftDown    1 519 234      5.007    303 k
+    5       C2-D2/Left     4 411 737     15.265    289 k

mpi-assign5/pv-split/position-start

+pos #1  O: 14,  X: 14
+       -----------
+      / O O O O O \
+     / O O O O O O \
+    / . . O O O . . \
+   / . . . . . . . . \
+  | . . . . . . . . . |
+   \ . . . . . . . . /
+    \ . . X X X . . /
+     \ X X X X X X /
+      \ X X X X X /
+       -----------
+
+
+X about to move...
+
+=========================================================

mpi-assign5/pv-split/referee.cpp

+/**
+ * Referee
+ *
+ * Send a start position into 2 game communication channels,
+ * observe positions sent in one channel, and if valid, broadcast
+ * them into other channel.
+ * For a time limited game, times are updated by referee itself.
+ *
+ * (C) 2005, Josef Weidendorfer
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/time.h>
+
+#include "board.h"
+#include "network.h"
+
+/* Global, static vars */
+static NetworkLoop l;
+static Board b;
+
+/* Time of last draw */
+static struct timeval t1;
+
+class MyDomain;
+static MyDomain *d1 = 0, *d2 = 0;
+
+/*
+ * Do other members in the channels exist at all?
+ * Only start time if there are players.
+ *
+ * Note: We can not distinguish between observers and players,
+ * so game always start when another member is seen.
+ */
+static bool d1MemberExists = false;
+static bool d2MemberExists = false;
+
+/* time limit in seconds (0: no time limit) */
+static int secsToPlay = 0;
+static int msecsToPlay[3] = {0,0,0};
+
+/* to set verbosity of NetworkLoop implementation */
+extern int verbose;
+
+#define DEFAULT_DOMAIN_PORT 13375 
+#define DEFAULT_DOMAIN_DIFF 50
+
+/* remote channel */
+static char* host[2] = {0,0};       /* not used per default */
+static int rport[2] = {DEFAULT_DOMAIN_PORT, DEFAULT_DOMAIN_PORT + DEFAULT_DOMAIN_DIFF};
+
+/* local channel */
+static int lport[2] = {DEFAULT_DOMAIN_PORT, DEFAULT_DOMAIN_PORT + DEFAULT_DOMAIN_DIFF};
+
+/* Where to read position to broadcast from? (0: start position) */
+static FILE* file = 0;
+
+class MyDomain: public NetworkDomain
+{
+public:
+    MyDomain(int p) : NetworkDomain(p) {}
+
+    void sendBoard();
+
+protected:
+    void received(char* str);
+    void newConnection(Connection*);
+};
+
+void MyDomain::sendBoard()
+{
+    static char tmp[500];
+    sprintf(tmp, "pos %s\n", b.getState());
+    if (verbose) {
+	printf(tmp+4);
+	int state = b.validState();
+	printf("%s\n", Board::stateDescription(state));
+    }
+    broadcast(tmp);
+}
+
+void MyDomain::received(char* str)
+{
+    if (strncmp(str, "quit", 4)==0) {
+	l.exit();
+	return;
+    }
+
+    if (strncmp(str, "pos ", 4)!=0) return;
+
+    if (b.validState() != Board::empty) {
+
+	Board newBoard;
+	newBoard.setState(str+4);
+
+	Move m = b.moveToReach(&newBoard, false);
+	if (m.type == Move::none) {
+	    printf("WARNING: Got a board which is not reachable via a valid move !?\n");
+	    return;
+	}
+	else {
+	    struct timeval t2;
+	    gettimeofday(&t2,0);
+	    int msecsPassed =
+		(1000* t2.tv_sec + t2.tv_usec / 1000) -
+		(1000* t1.tv_sec + t1.tv_usec / 1000);
+	    t1 = t2;
+
+	    int* pMSecs;
+	    if (b.actColor() == Board::color1) {
+		pMSecs = &(msecsToPlay[Board::color1]);
+		printf("O");
+	    }
+	    else {
+		pMSecs = &(msecsToPlay[Board::color2]);
+		printf("X");
+	    }
+	    printf(" draws '%s' (after %d.%03d secs)...\n",
+		   m.name(), msecsPassed/1000, msecsPassed%1000);
+
+	    if (*pMSecs > msecsPassed)
+		*pMSecs -= msecsPassed;
+	    else
+		*pMSecs = 0;
+	}
+    }
+
+    b.setState(str+4);
+    /* force our objective view regarding time */
+    b.setMSecsToPlay(Board::color1, msecsToPlay[Board::color1] );
+    b.setMSecsToPlay(Board::color2, msecsToPlay[Board::color2] );
+
+    printf(b.getState());	    
+    int state = b.validState();
+    printf("%s\n", Board::stateDescription(state));
+
+    switch(state) {
+	case Board::timeout1:
+	case Board::timeout2:
+	case Board::win1:
+	case Board::win2:
+	    l.exit();
+	default:
+	    break;
+    }
+
+    /* send to other domain */
+    if (d1 == this) if (d2) d2->sendBoard();
+    if (d2 == this) if (d1) d1->sendBoard();
+}
+
+void MyDomain::newConnection(Connection* c)
+{
+    NetworkDomain::newConnection(c);
+
+    static char tmp[500];
+    int len = sprintf(tmp, "pos %s\n", b.getState());
+    c->sendString(tmp, len);
+
+    /* adjust time if this is first connection for the channel */
+    if (!d1MemberExists && (this == d1)) {
+	d1MemberExists = true;
+	gettimeofday(&t1,0);
+    }
+    if (!d2MemberExists && (this == d2)) {
+	d2MemberExists = true;
+	gettimeofday(&t1,0);
+    }
+}
+
+static void printHelp(char* prg, bool printHeader)
+{
+    if (printHeader)
+	printf("Referee V 0.1 - (C) 2005 Josef Weidendorfer\n"
+	       "Broadcast a game position into 2 domains, observe moves played in one domain,\n"
+	       "and if valid, broadcast to other domain. Stops playing times itself.\n\n");
+
+    printf("Usage: %s [options] [<file>|-]\n\n"
+	   "  <file>           File containing game position (default: start position)\n"
+	   "  -                Position is read from standard input\n\n",
+	   prg);
+    printf(" Options:\n"
+	   "  -h / --help      Print this help text\n"
+	   "  -v / -vv         Be verbose / more verbose\n"
+	   "  -t <timeToPlay>  Start in tournament modus (limited time)\n"
+	   "  -p [host:][port] Connection to first (second) broadcast channel\n"
+	   "                   (default: %d / %d)\n\n",
+	   DEFAULT_DOMAIN_PORT, DEFAULT_DOMAIN_PORT + DEFAULT_DOMAIN_DIFF);
+    exit(1);
+}
+
+static void parseArgs(int argc, char* argv[])
+{
+    int domainsSet = 0;
+
+    int arg=0;
+    while(arg+1<argc) {
+	arg++;
+	if (argv[arg][0] == '-') {
+	    if (strcmp(argv[arg],"-h")==0 ||
+		strcmp(argv[arg],"--help")==0) printHelp(argv[0], true);
+	    if (strcmp(argv[arg],"-v")==0)	{
+		verbose = 1;
+		continue;
+	    }
+	    if (strcmp(argv[arg],"-vv")==0)	{
+		verbose = 2;
+		continue;
+	    }
+	    if ((strcmp(argv[arg],"-t")==0) && (arg+1<argc)) {
+		arg++;
+		secsToPlay = atoi(argv[arg]);
+		if (secsToPlay == 0) {
+		    printf("%s: WARNING - Ignoring tournament; %d secs to play\n",
+			   argv[0], secsToPlay);
+		}
+		continue;
+	    }
+	    if ((strcmp(argv[arg],"-p")==0) && (arg+1<argc)) {
+		arg++;
+		if (domainsSet>1) {
+		    printf("%s: WARNING - Domain specification %s ignored.\n",
+			   argv[0], argv[arg]);
+		    continue;
+		}
+		if (argv[arg][0]>'0' && argv[arg][0]<='9') {
+		    lport[domainsSet] = atoi(argv[arg]);
+		    domainsSet++;
+		    continue;
+		}
+		char* c = strrchr(argv[arg],':');
+		int p = 0;
+		if (c != 0) {
+		    *c = 0;
+		    p = atoi(c+1);
+		}
+		host[domainsSet] = argv[arg];
+		if (p) rport[domainsSet] = p;
+		domainsSet++;
+		continue;
+	    }
+	    if (strcmp(argv[arg],"-")==0) {
+		file = stdin;
+		continue;
+	    }
+	    printf("%s: ERROR - Unknown option %s\n", argv[0], argv[arg]);
+	    printHelp(argv[0], false);
+	}
+
+	file = fopen(argv[arg], "r");
+	if (!file) {
+	    printf("%s: ERROR - Can not open '%s' for reading start position\n",
+		   argv[0], argv[arg]);
+	    printHelp(argv[0], false);
+	}
+	break;
+    }
+
+    if (lport[0] == lport[1]) {
+	lport[1] = lport[0] + DEFAULT_DOMAIN_DIFF;
+	printf("Local port for domain 2 set to %d\n", lport[1]);
+    }
+}
+
+int main(int argc, char* argv[])
+{
+    parseArgs(argc, argv);
+    b.setVerbose(verbose);
+
+    if (file) {
+	char tmp[500];
+	int len = 0, c;
+	while( len<499 && (c=fgetc(file)) != EOF)
+	    tmp[len++] = (char) c;
+	tmp[len++]=0;
+
+	if (!b.setState(tmp)) {
+	    printf("%s: WARNING - Can not parse given position; using start position\n", argv[0]);
+	    b.begin(Board::color1);
+	}
+    }
+    else
+	b.begin(Board::color1);
+
+    if (secsToPlay >= 0) {
+	msecsToPlay[Board::color1] = 1000 * secsToPlay;
+	msecsToPlay[Board::color2] = 1000 * secsToPlay;
+    }
+    else {
+	msecsToPlay[Board::color1] = b.msecsToPlay(Board::color1);
+	msecsToPlay[Board::color2] = b.msecsToPlay(Board::color2);
+    }
+    b.setMSecsToPlay(Board::color1, msecsToPlay[Board::color1] );
+    b.setMSecsToPlay(Board::color2, msecsToPlay[Board::color2] );
+
+    /*
+     * Register domains at NetworkLoop. Existing members will
+     * get sent the board via MyDomain::newConnection
+     */
+    d1 = new MyDomain(lport[0]);
+    if (host[0]) d1->addConnection(host[0], rport[0]);
+    d2 = new MyDomain(lport[1]);
+    if (host[1]) d2->addConnection(host[1], rport[1]);
+
+    l.install(d1);
+    l.install(d2);
+
+    d1MemberExists = d1->count() >0;
+    d2MemberExists = d2->count() >0;
+
+    gettimeofday(&t1,0);
+
+    return l.run();
+}

mpi-assign5/pv-split/search-abid.cpp

+/**
+ * A real world, sequential strategy:
+ * Alpha/Beta with Iterative Deepening (ABID)
+ *
+ * (c) 2005, Josef Weidendorfer
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <mpi.h>
+#include <string.h>
+
+#include "search.h"
+#include "board.h"
+
+extern int thread_rank;
+extern int num_threads;
+
+
+
+/**
+ * Entry point for search
+ *
+ * Does iterative deepening and alpha/beta width handling, and
+ * calls alpha/beta search
+ */
+
+void ABIDStrategy::searchBestMove()
+{    
+    int alpha = -15000, beta = 15000;
+    int nalpha, nbeta, currentValue = 0;
+
+    _pv.clear(_maxDepth);
+    _currentBestMove.type = Move::none;
+    _currentMaxDepth=1;
+    
+    /* iterative deepening loop */
+    do {
+
+	/* searches on same level with different alpha/beta windows */
+	while(1) {
+
+	    nalpha = alpha, nbeta = beta;
+	    _inPV = (_pv[0].type != Move::none);
+
+	    if (_sc && _sc->verbose()) {
+		char tmp[100];
+		sprintf(tmp, "Alpha/Beta [%d;%d] with max depth %d", alpha, beta, _currentMaxDepth);
+		_sc->substart(tmp);
+	    }
+
+	    currentValue = pv_split(alpha, beta);
+	    printf("Subsearch finished with currentValue = %d\n", currentValue);
+
+	    /* stop searching if a win position is found */
+	    if (currentValue > 14900 || currentValue < -14900)
+		_stopSearch = true;
+
+	    /* Don't break out if we haven't found a move */
+	    if (_currentBestMove.type == Move::none)
+		_stopSearch = false;
+
+	    if (_stopSearch) break;
+
+	    /* if result is outside of current alpha/beta window,
+	     * the search has to be rerun with widened alpha/beta
+	     */
+	    if (currentValue <= nalpha) {
+		alpha = -15000;
+		if (beta<15000) beta = currentValue+1;
+		continue;
+	    }
+	    if (currentValue >= nbeta) {
+		if (alpha > -15000) alpha = currentValue-1;
+		beta=15000;
+		continue;
+	    }
+	    break;
+	}
+       
+	/* Window in both directions cause of deepening */
+	alpha = currentValue - 200, beta = currentValue + 200;
+
+	if (_stopSearch) break;
+
+	_currentMaxDepth++;
+    }
+    while(_currentMaxDepth <= _maxDepth);
+
+    _bestMove = _currentBestMove;
+}
+
+int ABIDStrategy::pv_split(int alpha0, int beta0)
+{   
+
+	int depth;
+	int value;
+    	int currentValue = -15000;
+	int slave_id;
+	int num_slaves;
+	int pending_jobs;
+	Slave_Input slave_input;
+	Slave_Output *slave_output;
+	MPI_Request *rcv_rq;
+	MoveList list;
+	Move m, *movechain;
+	int *alpha, *beta;
+
+	rcv_rq = (MPI_Request *) malloc (num_threads * sizeof(MPI_Request));
+	slave_output = (Slave_Output *) malloc (num_threads * sizeof(Slave_Output));
+	movechain = (Move*) malloc ((_currentMaxDepth+1)* sizeof (Move));
+	alpha = (int*) malloc((_currentMaxDepth+2)*sizeof(int));
+	beta = (int*) malloc((_currentMaxDepth+2)*sizeof(int));
+
+
+	alpha[0] = alpha0;
+	beta[0] = beta0;
+    	_currentBestMove.type = Move::none;
+
+	// Play moves from the pv until you reach the lowest level
+	// If pv-moves are not possible use random moves
+	// Store the sequence of moves in movechain
+	depth = 0;
+	while (depth < (_currentMaxDepth-1)) 
+	{
+		list.clear();
+	    	_board->generateMoves(list);
+		m = _pv[depth];
+
+		// check if pv-move is possible
+		if ((m.type != Move::none) && (!list.isElement(m, 0, false)))
+			m.type = Move::none;
+		
+		// get random move if pv-move is not possible
+		if (m.type == Move::none)
+			list.getNext(m, Move::none);
+
+		_board->playMove(m);
+		movechain[depth] = m;
+
+		alpha[depth+1] = -beta[depth];
+		beta[depth+1] = -alpha[depth];
+
+		depth++;
+	}
+
+	// Start at the second lowest level and move back up the gametree
+	// Devide the work at each level
+	depth = _currentMaxDepth-1;
+	while (depth >= 0)
+    	{	
+		slave_id = 0;
+		list.clear();
+		_board->generateMoves(list);
+		// delete the move we already checked from the list
+		if (depth < _currentMaxDepth-1)
+			list.isElement(movechain[depth], 0, true);
+
+		strcpy(slave_input.boardstate,_board->getState());
+		slave_input.alpha = -beta[depth];
+		slave_input.beta = -alpha[depth];
+		slave_input.depth = depth+1;
+		slave_input.currentMaxDepth = _currentMaxDepth;
+
+		printf("Thread 0 testing %d moves at depth = %d\n",list.getLength(), depth);
+		while ( list.getNext(m, Move::none) ) 
+		{
+			slave_input.move = m;	
+			MPI_Send(&slave_input, sizeof(Slave_Input), MPI_BYTE, slave_id+1, 10, MPI_COMM_WORLD);
+			MPI_Irecv(&slave_output[slave_id], sizeof(Slave_Output), MPI_BYTE, slave_id+1,
+				10, MPI_COMM_WORLD, &rcv_rq[slave_id]);
+
+			slave_id++;
+
+			if (slave_id >= (num_threads-1))
+				break;
+		}
+
+		num_slaves = slave_id;
+		pending_jobs = num_slaves;
+
+		while (pending_jobs > 0)
+		{
+				MPI_Waitany(num_slaves, rcv_rq, &slave_id, MPI_STATUS_IGNORE);
+				_sc->_leavesVisited += slave_output[slave_id].num_leaves;
+				_sc->_nodesVisited += slave_output[slave_id].num_nodes;
+				value = slave_output[slave_id].eval;
+				if (value > currentValue)
+				{
+					currentValue = value;
+					_pv = slave_output[slave_id].pv;
+
+					if (_sc) 
+						_sc->foundBestMove(depth, _pv[depth], currentValue);
+					if (currentValue > alpha[depth]) 
+					{
+						alpha[depth] = currentValue;	
+						slave_input.beta = -alpha[depth];
+					}
+				}
+
+				if (list.getNext(m, Move::none))
+				{
+					slave_input.move = m;	
+
+					MPI_Send(&slave_input, sizeof(Slave_Input), MPI_BYTE, slave_id+1, 10, MPI_COMM_WORLD);
+					MPI_Irecv(&slave_output[slave_id], sizeof(Slave_Output), MPI_BYTE, slave_id+1,
+						10, MPI_COMM_WORLD, &rcv_rq[slave_id]);
+				}
+				else
+					pending_jobs--;
+		}
+
+		if (depth > 0)
+		{
+			_board->takeBack();
+			_pv.update(depth-1, movechain[depth-1]);
+			currentValue = -currentValue;
+			if (currentValue > alpha[depth -1])
+				alpha[depth-1] = currentValue;
+		}
+		if (depth == 0)
+		    	_currentBestMove = _pv[0];
+		if (_sc) 
+			_sc->finishedNode(depth, _pv.chain(depth));
+		depth--;
+    	}
+
+	free(slave_output);
+	free(rcv_rq);
+	free(movechain);
+	free(alpha);
+	free(beta);
+
+	return currentValue;
+}
+
+
+/*
+ * Alpha/Beta search
+ *
+ * - first, start with principal variation
+ * - depending on depth, we only do depth search for some move types
+ */
+int ABIDStrategy::alphabeta(int depth, int alpha, int beta)
+{
+    int currentValue = -14999+depth, value;
+    Move m;
+    MoveList list;
+    bool depthPhase, doDepthSearch;
+
+    /* We make a depth search for the following move types... */
+    int maxType = (depth < _currentMaxDepth-1)  ? Move::maxMoveType :
+	          (depth < _currentMaxDepth)    ? Move::maxPushType :
+	                                          Move::maxOutType;
+
+    _board->generateMoves(list);
+
+    if (_sc && _sc->verbose()) {
+	    char tmp[100];
+	    sprintf(tmp, "Alpha/Beta [%d;%d], %d moves (%d depth)", alpha, beta,
+		    list.count(Move::none), list.count(maxType));
+	    _sc->startedNode(depth, tmp);
+    }
+
+    // don't use moves from the principal variation
+    m.type = Move::none;
+
+    // first, play all moves with depth search
+    depthPhase = true;
+
+    while (1) {
+
+	// get next move
+	if (m.type == Move::none) {
+            if (depthPhase)
+		depthPhase = list.getNext(m, maxType);
+            if (!depthPhase)
+		if (!list.getNext(m, Move::none)) break;
+	}
+	// we could start with a non-depth move from principal variation
+	doDepthSearch = depthPhase && (m.type <= maxType);
+
+	_board->playMove(m);
+
+	/* check for a win position first */
+	if (!_board->isValid()) {
+
+	    /* Shorter path to win position is better */
+	    value = 14999-depth;
+	}
+	else {
+
+            if (doDepthSearch) {
+		/* opponent searches for its maximum; but we want the
+		 * minimum: so change sign (for alpha/beta window too!)
+		 */
+		value = -alphabeta(depth+1, -beta, -alpha);
+            }
+            else {
+		value = evaluate();
+	    }
+	}
+
+	_board->takeBack();
+
+	/* best move so far? */
+	if (value > currentValue) {
+	    currentValue = value;
+	    _pv.update(depth, m);
+
+	    /* alpha/beta cut off or win position ... */
+	    if (currentValue>14900 || currentValue >= beta) {
+		if (_sc) _sc->finishedNode(depth, _pv.chain(depth));
+		return currentValue;
+	    }
+
+	    /* maximize alpha */
+	    if (currentValue > alpha) alpha = currentValue;
+	}
+
+	if (_stopSearch) break; // depthPhase=false;
+	m.type = Move::none;
+    }
+    
+    if (_sc) _sc->finishedNode(depth, _pv.chain(depth));
+
+    return currentValue;
+}
+
+// register ourselve
+ABIDStrategy abidStrategy;

mpi-assign5/pv-split/search-minimax.cpp

+/*
+ * Very simple example strategy:
+ * Search all possible positions reachable via one move,
+ * and return the move leading to best position
+ *
+ * (c) 2006, Josef Weidendorfer
+ */
+#include <stdio.h>
+#include "search.h"
+#include "board.h"
+#include "eval.h"
+
+#define pretty_print(name, val) printf("%s = %d: %s: %s: %d\n", name, val,  __FILE__,__FUNCTION__,__LINE__);
+
+#define likely(x)       __builtin_expect((x),1)
+#define unlikely(x)     __builtin_expect((x),0)
+
+/**
+ * To create your own search strategy:
+ * - copy this file into another one,
+ * - change the class name one the name given in constructor,
+ * - adjust clone() to return an instance of your class
+ * - adjust last line of this file to create a global instance
+ *   of your class
+ * - adjust the Makefile to include your class in SEARCH_OBJS
+ * - implement searchBestMove()
+ *
+ * Advises for implementation of searchBestMove():
+ * - call foundBestMove() when finding a best move since search start
+ * - call finishedNode() when finishing evaluation of a tree node
+ * - Use _maxDepth for strength level (maximal level searched in tree)
+ */
+class MinimaxStrategy: public SearchStrategy
+{
+	public:
+		// Defines the name of the strategy
+		MinimaxStrategy(): SearchStrategy("MINIMAX") {}
+
+		// Factory method: just return a new instance of this class
+		SearchStrategy* clone() { return new MinimaxStrategy(); }
+
+	private:
+
+		/**
+		 * Implementation of the strategy.
+		 */
+		void searchBestMove();
+		int minimax();
+};
+
+int current_depth=0;
+#define MAX_DEPTH 3
+
+int MinimaxStrategy::minimax()
+{
+	Move m;
+	MoveList list;
+//	int maxEval, minEval;
+	int bestEval;
+	int eval;	
+	int sign;
+
+	if(current_depth == MAX_DEPTH)
+		return evaluate();
+
+	bestEval = -17000;
+//	maxEval = -17000;
+//	minEval = 17000;
+
+	generateMoves(list);
+	
+	if(evaluate() == 16000)
+	{
+		if(current_depth == 0)
+			finishedNode(0,0);
+		pretty_print("current_depth", current_depth);
+		return ((current_depth % 2) ==0) ? -16000 : 16000;
+	}
+
+	if((MAX_DEPTH-current_depth)%2 == 1)
+		sign = 1;
+	else
+		sign = -1;
+
+	while(list.getNext(m))	
+	{
+		if(current_depth < MAX_DEPTH)
+		{
+			current_depth++;
+			playMove(m);
+			eval=minimax();
+			takeBack();
+			current_depth--;
+		}
+
+		if(sign*eval > bestEval)
+		{
+			bestEval = sign*eval;
+			if(unlikely(current_depth == 0)) {
+				pretty_print("Eval", bestEval);
+				foundBestMove(0, m, eval);
+			}
+		}
+
+#if 0
+		if((MAX_DEPTH - current_depth +1) % 2 == 0)
+		{
+			if(eval > maxEval)
+			{
+				maxEval=eval;
+				if(current_depth == 0) {
+					pretty_print("Eval", eval);
+					foundBestMove(0, m, eval);
+				}
+			}
+		}
+		else
+		{
+			if(eval < minEval)
+			{
+				minEval=eval;                   
+				if(current_depth == 0) {
+					pretty_print("Eval2", eval);
+					foundBestMove(0, m, eval);
+				}
+
+			}
+		}
+#endif
+	}
+	bestEval = sign*bestEval;
+
+	if(current_depth == 0)
+		finishedNode(0,0);
+#if 0
+	if((MAX_DEPTH - current_depth +1) % 2 == 0)
+		return maxEval;
+	else
+                return minEval;
+#endif
+
+	return bestEval;
+}
+
+void MinimaxStrategy::searchBestMove()
+{
+
+// KUKU : Here we have to implement the minimax strategy
+// Minimax strategy tries to minimize the maximum possible outcome of opponent.
+// At each turn, we check for each move the max positive outcome for opponent.
+// We choose the move for which the max is least.
+// To check this, we look at more than one levels in the Game Tree.
+	// we try to maximize bestEvaluation
+/*	int bestEval = minEvaluation();
+	int eval;
+
+	Move m;
+	MoveList list;
+
+	// generate list of allowed moves, put them into <list>
+	generateMoves(list);
+
+	// loop over all moves
+	while(list.getNext(m)) {
+
+		// draw move, evalute, and restore position
+		playMove(m);
+		eval = evaluate();
+		takeBack();
+
+		if (eval > bestEval) {
+			bestEval = eval;
+			foundBestMove(0, m, eval);
+		}
+	}
+
+	finishedNode(0,0);
+*/
+	minimax();
+}
+
+// register ourselve as a search strategy
+MinimaxStrategy minimaxStrategy;

mpi-assign5/pv-split/search-onelevel.cpp

+/**
+ * Very simple example strategy:
+ * Search all possible positions reachable via one move,
+ * and return the move leading to best position
+ *
+ * (c) 2006, Josef Weidendorfer
+ */
+
+#include "search.h"
+#include "board.h"
+#include "eval.h"
+
+/**
+ * To create your own search strategy:
+ * - copy this file into another one,
+ * - change the class name one the name given in constructor,
+ * - adjust clone() to return an instance of your class
+ * - adjust last line of this file to create a global instance
+ *   of your class
+ * - adjust the Makefile to include your class in SEARCH_OBJS
+ * - implement searchBestMove()
+ *
+ * Advises for implementation of searchBestMove():
+ * - call foundBestMove() when finding a best move since search start
+ * - call finishedNode() when finishing evaluation of a tree node
+ * - Use _maxDepth for strength level (maximal level searched in tree)
+ */
+class OneLevelStrategy: public SearchStrategy
+{
+ public:
+    // Defines the name of the strategy
+    OneLevelStrategy(): SearchStrategy("OneLevel") {}
+
+    // Factory method: just return a new instance of this class
+    SearchStrategy* clone() { return new OneLevelStrategy(); }
+
+ private:
+
+    /**
+     * Implementation of the strategy.
+     */
+    void searchBestMove();
+};
+
+
+void OneLevelStrategy::searchBestMove()
+{
+    // we try to maximize bestEvaluation
+    int bestEval = minEvaluation();
+    int eval;
+
+    Move m;
+    MoveList list;
+
+    // generate list of allowed moves, put them into <list>
+    generateMoves(list);
+
+    // loop over all moves
+    while(list.getNext(m)) {
+
+	// draw move, evalute, and restore position
+	playMove(m);
+	eval = evaluate();
+	takeBack();
+	
+	if (eval > bestEval) {
+	    bestEval = eval;
+	    foundBestMove(0, m, eval);
+	}
+    }
+
+    finishedNode(0,0);
+}
+
+// register ourselve as a search strategy
+OneLevelStrategy oneLevelStrategy;

mpi-assign5/pv-split/search.cpp

+/*
+ * Search the game play tree for move leading to
+ * position with highest evaluation
+ *
+ * (c) 2005, Josef Weidendorfer
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <sys/time.h>
+#include <stdlib.h>
+
+#include "board.h"
+#include "search.h"
+#include "eval.h"
+
+
+
+/// SearchCallbacks
+
+static struct timeval t1, t2;
+static int kevalsPerSec = 30;
+static int evalCounter = 0;
+
+void SearchCallbacks::start(int msecsForSearch)
+{
+    _leavesVisited = 0;
+    _nodesVisited = 0;
+    gettimeofday(&t1,0);
+
+    evalCounter = 0;
+    _msecsForSearch = msecsForSearch;
+
+    if (!_verbose) return;
+
+    if (_msecsForSearch>0)
+	printf(" Search started (ca. %d.%03d secs) ...\n",
+	       _msecsForSearch / 1000, _msecsForSearch % 1000);
+    else
+	printf(" Search started ...\n");
+}
+
+void SearchCallbacks::substart(char* s)
+{
+    if (!_verbose) return;
+
+    printf(" Subsearch %s ...\n", s);
+}
+
+int i=0;
+unsigned int avg_kleavesPerSec = 0;
+int _msecs;
+
+
+void SearchCallbacks::finished(Move& m)
+{
+    gettimeofday(&t2,0);
+    _msecsPassed =
+	(1000* t2.tv_sec + t2.tv_usec / 1000) -
+	(1000* t1.tv_sec + t1.tv_usec / 1000);
+	
+	_msecs = _msecsPassed;
+
+    if (!_verbose) return;
+
+    if (_msecsPassed <1) _msecsPassed = 1;
+    if (_nodesVisited<1) _nodesVisited = 1;
+
+    printf(" Search finished after %d.%03d secs\n",
+	   _msecsPassed / 1000, _msecsPassed % 1000);
+    printf("  Found move '%s'\n", m.name());
+    printf("  Leaves visited: %d (%d k/s) \n",
+	   _leavesVisited, _leavesVisited /_msecsPassed);
+    printf("  Nodes visited: %d (%d leaves per node)\n",
+	   _nodesVisited, _leavesVisited/_nodesVisited );
+   
+        avg_kleavesPerSec = (i*avg_kleavesPerSec + _leavesVisited/_msecsPassed)/(i+1);
+        i++;
+ 
+    int eps = _leavesVisited /_msecsPassed;
+    if (eps>kevalsPerSec) kevalsPerSec = eps;
+}
+
+bool SearchCallbacks::afterEval()
+{
+    _leavesVisited++;
+    /*
+    int ms = _msecsForSearch / 3;
+    if (ms > 500) ms = 500;
+    if (ms < 200) ms = 200;
+
+    evalCounter++;
+
+    if (evalCounter < ms * kevalsPerSec) return false;
+    
+    // FIXME: Check for network events
+
+    evalCounter = 0;
+
+    gettimeofday(&t2,0);
+    _msecsPassed =
+	(1000* t2.tv_sec + t2.tv_usec / 1000) -
+	(1000* t1.tv_sec + t1.tv_usec / 1000);
+
+    if (_msecsPassed <1) _msecsPassed = 1;
+    if (_nodesVisited<1) _nodesVisited = 1;
+
+    int eps = _leavesVisited / _msecsPassed;
+    if (_verbose)
+	printf(" EvalRate %d k/s (%d evals, %d msecs)\n",
+	       eps, _leavesVisited, _msecsPassed);
+    if (eps>kevalsPerSec) kevalsPerSec = eps;
+
+    if ((_msecsForSearch > 0) && (_msecsPassed > _msecsForSearch)) {
+	printf(" Stop!\n");
+	return true;
+    }
+    */
+    return false;
+}
+
+void SearchCallbacks::foundBestMove(int d, const Move& m, int value)
+{
+    if (d+2 >= _verbose) return;
+
+    static char* spaces = "                     ";
+    printf(" %sNew best move '%s', value %d ...\n",
+	   spaces+20-d, m.name(), value);
+}
+
+int _leaveStart[10], _nodeStart[10];
+
+void SearchCallbacks::startedNode(int d, char* s)
+{
+    if (d+1 >= _verbose) return;
+
+    if (d<10) {
+	_leaveStart[d] = _leavesVisited;
+	_nodeStart[d] = _nodesVisited;
+    }
+
+    static char* spaces = "                     ";
+    printf(" %sStarted node at depth %d (%s)\n", spaces+20-d, d, s);
+}
+
+void SearchCallbacks::finishedNode(int d, Move* chain)
+{
+    _nodesVisited++;
+
+    if (d+1 >= _verbose) return;
+
+    static char* spaces = "                     ";
+    printf(" %sFinished node at depth %d", spaces+20-d, d);
+    if (chain) {
+	int c = 0;
+	while( (c<4) && (chain->type != Move::none)) {
+	    printf("%s%s", (c==0) ? " (" : ", ", chain->name());
+	    chain++;
+	    c++;
+	}
+	printf(")");
+    }
+    printf("\n");
+
+    if (d<10) {
+	int l = _leavesVisited - _leaveStart[d];
+	int n = _nodesVisited - _nodeStart[d];
+	if (n<1) n=1;
+	printf(" %s %d leaves, %d nodes visited (%d leaves per node)\n", spaces+20-d,
+	       l,n, l/n);
+    }
+}
+
+
+
+
+
+/// SearchStrategy
+
+
+static SearchStrategy* searchStrategies = 0;
+
+SearchStrategy::SearchStrategy(char* n, int prio)
+{
+    _maxDepth = 1;
+    _sc = 0;
+    _ev = 0;
+    _name = n;
+    _next = 0;
+    _prio = prio;
+
+    // register if not already registered
+    SearchStrategy *ss = searchStrategies, *prev = 0;
+    while(ss) {
+	if (strcmp(ss->_name, n) == 0) return;	
+	if (ss->_prio > prio) break;
+	prev = ss;
+	ss = ss->_next;
+    }
+
+    if (prev) {
+	_next = prev->_next;
+	prev->_next = this;
+    }
+    else {
+	_next = searchStrategies;
+	searchStrategies = this;
+    }
+}
+
+char** SearchStrategy::strategies()
+{
+    static char** sslist = 0;
+
+    int count = 0;
+    SearchStrategy* ss = searchStrategies;
+    while(ss) {
+	count++;
+	ss = ss->_next;
+    }
+
+    sslist = (char**) realloc(sslist, sizeof(char*) * (count+1) );
+
+    count = 0;
+    ss = searchStrategies;
+    while(ss) {
+	sslist[count] = ss->_name;
+	count++;
+	ss = ss->_next;
+    }
+    sslist[count] = 0;
+
+    return sslist;
+}
+
+SearchStrategy* SearchStrategy::create(char* n)
+{
+    SearchStrategy* ss = searchStrategies;
+    while(ss) {
+	if (strcmp(ss->_name, n)==0) return ss;
+	ss = ss->_next;
+    }
+    return 0;
+}
+
+SearchStrategy* SearchStrategy::create(int i)
+{
+    int count = 0;
+    SearchStrategy* ss = searchStrategies;
+    while(ss) {	
+	if (count == i) return ss;
+	count++;
+	ss = ss->_next;
+    }
+    return 0;
+}
+
+Move& SearchStrategy::bestMove(Board* b)
+{
+    if (_sc) {
+	int ms = b->msecsToPlay(b->actColor());
+	if (ms>0) {
+	    int minTokens = b->getColor1Count();
+	    int tokens = b->getColor2Count();
+	    if (tokens < minTokens) minTokens = tokens;
+	    int mvs = 60 - 10*(14-minTokens);
+	    ms = ms/mvs;
+	}
+	_sc->start(ms);
+    }
+
+    _board = b;
+    _bestMove.type = Move::none;
+    _stopSearch = false;
+
+    searchBestMove();
+
+    if (_sc) _sc->finished(_bestMove);
+
+    return _bestMove;
+}
+
+Move& SearchStrategy::nextMove()
+{
+    static Move m;
+    return m; // returns invalid
+}
+
+int SearchStrategy::evaluate()
+{
+    int v = _ev->calcEvaluation(_board); 
+    if (_sc) _stopSearch = _sc->afterEval();
+    
+
+    return v;
+}
+
+int SearchStrategy::minEvaluation()
+{
+    return _ev ? _ev->minValue() : -1; 
+}
+
+int SearchStrategy::maxEvaluation()
+{
+    return _ev ? _ev->maxValue() : -1; 
+}
+
+void SearchStrategy::generateMoves(MoveList& list)
+{
+    if (_board)
+	_board->generateMoves(list); 
+}
+
+void SearchStrategy::playMove(const Move& m)
+{
+    if (_board)
+	_board->playMove(m);
+}
+
+bool SearchStrategy::takeBack()
+{
+    return _board ? _board->takeBack() : false; 
+}
+
+void SearchStrategy::foundBestMove(int d, const Move& m, int eval)
+{
+    if (d==0) _bestMove = m;
+    if (_sc)
+	_sc->foundBestMove(d, m, eval);
+}
+
+void SearchStrategy::finishedNode(int d, Move* bestList)
+{
+    if (_sc)
+	_sc->finishedNode(d, bestList);
+}