int TryWinLine(int board[3][3], int us,
	       int r1, int c1,
	       int r2, int c2,
	       int r3, int c3)
{
    if (board[r1][c1] == us
	&& board[r2][c2] == us
	&& board[r3][c3] == 0) {
	board[r3][c3] = us;
	return 1;
    }
    if (board[r1][c1] == us
	&& board[r3][c3] == us
	&& board[r2][c2] == 0) {
	board[r2][c2] = us;
	return 1;
    }
    if (board[r2][c2] == us
	&& board[r3][c3] == us
	&& board[r1][c1] == 0) {
	board[r1][c1] = us;
	return 1;
    }
    return 0;
}