private boolean isChessmen(final int player, final int x, final int y) {
		int fixX = convertX(player, x);
		int fixY = convertY(player, y);
		for (Integer id : chessmens.keySet()) {
			ChessmenData chessmen = chessmens.get(id);
			if (chessmen.getFixX() == fixX && chessmen.getFixY() == fixY) {
				return true;
			}
		}
		return false;
	}