working

app/src/main/java/chess/ai/PieceCost.java

@@ -14,6 +14,13 @@ public class PieceCost implements PieceVisitor<Integer> {
 
 	private final Color player;
 
+	public static final int BISHOP = 3;
+	public static final int KING = 90;
+	public static final int KNIGHT = 3;
+	public static final int PAWN = 1;
+	public static final int QUEEN = 9;
+	public static final int ROOK = 5;
+
 	public PieceCost(Color color) {
 		this.player = color;
 	}
@@ -22,39 +29,39 @@ public class PieceCost implements PieceVisitor<Integer> {
 		if (piece == null)
 			return 0;
 		int cost = visit(piece);
-		if (piece.getColor() == player)
+		if (piece.getColor() != player)
 			cost = -cost;
 		return cost;
 	}
 
 	@Override
 	public Integer visitPiece(Bishop bishop) {
-		return 3;
+		return BISHOP;
 	}
 
 	@Override
 	public Integer visitPiece(King king) {
-		return 90;
+		return KING;
 	}
 
 	@Override
 	public Integer visitPiece(Knight knight) {
-		return 3;
+		return KNIGHT;
 	}
 
 	@Override
 	public Integer visitPiece(Pawn pawn) {
-		return 1;
+		return PAWN;
 	}
 
 	@Override
 	public Integer visitPiece(Queen queen) {
-		return 9;
+		return QUEEN;
 	}
 
 	@Override
 	public Integer visitPiece(Rook rook) {
-		return 5;
+		return ROOK;
 	}
 
 }