int TryWinBoard(int board[3][3], int us)
{
    int i;

    for (i = 0;  i < 3;  ++i) {
	if (TryWinLine(board, us,
		       i,0, i,1, i,2)) {
	    return 1;
	}
	if (TryWinLine(board, us,
		       0,i, 1,i, 2,i)) {
	    return 1;
	}
    }
    if (TryWinLine(board, us,
		   0,0, 1,1, 2,2)) {
	return 1;
    }
    if (TryWinLine(board, us,
		   0,2, 1,1, 2,0)) {
	return 1;
    }
    return 0;
}