AlphaBetaPlayer Implemented and score fixed.

src/othello/Main.java

@@ -1,14 +1,14 @@
 package othello;
 
-import othello.players.NegamaxPlayer;
+import othello.players.AlphaBetaPlayer;
 import othello.players.Player;
 
 public class Main {
 
 
 	public static void main(String[] args) {
-		Player p1 = new NegamaxPlayer(3);
-		Player p2 = new NegamaxPlayer(2);
+		Player p1 = new AlphaBetaPlayer(5);
+		Player p2 = new AlphaBetaPlayer(5);
 		Player[][] board = initialize(p1, p2);
 		State game = new State(board, p1, p2);
 		System.out.println("joueur 1: " + p1);
@@ -19,9 +19,10 @@ public class Main {
 			game = game.play(player.play(game));
 		}
 		System.out.println(game.toString());
+		System.out.println(game.getN1()+"   "+ game.getN2());
 		System.out.println(game.getWinner() + " a gagné la partie");
-		System.out.println(game.getScore(p1));
-		System.out.println(game.getScore(p2));
+		System.out.println("Score joueur 1 -> " + game.getN1());
+		System.out.println("Score joueur 2 -> "+ game.getN2());
 
 	}
 	

src/othello/State.java

@@ -61,12 +61,17 @@ public class State {
 	public int getScore(Player player) {
 		return player == player1 ? (n1/(n1+n2)) : (n2/(n1+n2));
 	}
+	public int getN1(){
+		return this.n1;
+	}
+	public int getN2(){
+		return this.n2;
+	}
 
 	public Player getWinner() {
-		int scoreP1 = getScore(player1), scoreP2 = getScore(player2);
-		if(scoreP1 > scoreP2)
+		if(this.n1 > this.n2)
 			return player1;
-		else if(scoreP2 > scoreP1)
+		else if(this.n2 > this.n1)
 			return player2;
 		return null;
 	}

src/othello/players/AlphaBetaPlayer.java

@@ -0,0 +1,50 @@
+package othello.players;
+
+import othello.Pair;
+import othello.Point;
+import othello.State;
+
+public class AlphaBetaPlayer extends Player{
+
+    public AlphaBetaPlayer(int depth) {
+        super(depth);
+    }
+
+    @Override
+    public Pair<Point, Point> play(State game) {
+        int bestValue = Integer.MIN_VALUE;
+        Pair<Point, Point> bestMove = null;
+        for(Pair<Point, Point> move : game.getMove(game.getCurrentPlayer())) {
+            State nextState = game.play(move);
+            int value = -alphabeta(nextState, this.depth,Integer.MIN_VALUE,Integer.MAX_VALUE);
+            if (value > bestValue) {
+                bestValue = value;
+                bestMove = move;
+            }
+        }
+        return bestMove;
+    }
+
+    private int alphabeta(State state, int depth,int alpha,int beta) {
+        if(depth == 0 || state.isOver()) {
+            return evaluate(state);
+        }
+        else{
+            for (Pair<Point, Point> move : state.getMove(state.getCurrentPlayer())) {
+                State nextState = state.play(move);
+                alpha = Math.max(alpha,-alphabeta(nextState,depth-1,-beta,-alpha));
+                if(alpha >= beta)
+                    return alpha;
+            }
+            return alpha;
+        }
+    }
+    private int evaluate(State game){
+        Player winner = game.getWinner();
+        if(winner == null)
+            return 0;
+        else if(winner == game.getCurrentPlayer())
+            return -1;
+        return 1;
+    }
+}