fix State.play(move) + move and fix evaluate from Negamax and AlphaBeta to Player

src/othello/State.java

@@ -78,20 +78,22 @@ public class State {
 
 	public State play(Pair<Point,Point> move) {
 		State copy = this.copy();
-		if(move!=null) {
+		boolean isJump = move.getLeft().isJump(move.getRight(), copy.board);
 		copy.board[move.getRight().getY()][move.getRight().getX()] = copy.currentPlayer;
-			if (move.getLeft().isJump(move.getRight(), copy.board)) {
+		if (isJump) {
 			copy.board[move.getLeft().getY()][move.getLeft().getX()] = null;
-			}
+			copy.board[(move.getLeft().getY() + move.getRight().getY()) / 2][(move.getLeft().getX() + move.getRight().getX()) / 2] = copy.currentPlayer;
+		} else {
 			for (int i = -1; i < 2; i++) {
 				for (int z = -1; z < 2; z++) {
 					try {
+						if(copy.board[move.getRight().getY() + i][move.getRight().getX() + z] != null)
 							copy.board[move.getRight().getY() + i][move.getRight().getX() + z] = copy.currentPlayer;
-					} catch (IndexOutOfBoundsException ignored) {
-					}
+					} catch (IndexOutOfBoundsException ignored) {}
 				}
 			}
 		}
+
 		int ni = 0, nj = 0;
 		for (Player[] players : copy.board) {
 			for (Player player : players) {

src/othello/players/AlphaBetaPlayer.java

@@ -39,12 +39,4 @@ public class AlphaBetaPlayer extends Player{
             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;
-    }
 }

src/othello/players/NegamaxPlayer.java

@@ -38,14 +38,6 @@ public class NegamaxPlayer extends Player {
             return m;
         }
     }
-    private int evaluate(State game){
-        Player winner = game.getWinner();
-        if(winner == null)
-            return 0;
-        else if(winner == game.getCurrentPlayer())
-            return -1;
-        return 1;
-    }
 
     @Override
     public boolean equals(Object obj) {

src/othello/players/Player.java

@@ -14,4 +14,13 @@ public abstract class Player {
 
 	public abstract Pair<Point, Point> play(State board);
 
+	protected int evaluate(State game){
+		Player winner = game.getWinner();
+		if(winner == null)
+			return 0;
+		else if(winner == game.getCurrentPlayer())
+			return 1;
+		return -1;
+	}
+
 }