check draw

app/src/main/java/chess/model/pieces/Queen.java

@@ -14,4 +14,9 @@ public class Queen extends Piece {
 	public <T> T accept(PieceVisitor<T> visitor) {
 		return visitor.visitPiece(this);
 	}
+
+	@Override
+	public int hashCode() {
+		return 4;
+	}
 }