public boolean winDiagonal() {
		char first = board[0][0];
		if ((first == 'o' || first == 'x') && board[1][1] == first
				&& board[2][2] == first) {
			return true;
		}
		first = board[0][2];
		if ((first == 'o' || first == 'x') && board[1][1] == first
				&& board[2][0] == first) {
			return true;
		}
		return false;
	}