private static boolean isChessmen(final ChessBoardEntity board, final int x, final int y) {
		boolean result = false;
		List<ChessmenEntity> chessmens = board.getChessmens();
		for (ChessmenEntity c : chessmens) {
			if (x == c.getPosition().getX() && y == c.getPosition().getY()) {
				result = true;
				break;
			}
		}
		return result;
	}