private SudokuSolver GuessFork()
{
Point position = GetSmallestOptionPosition();
if (position.X < 0 || position.Y < 0)
{
return(null);
}
foreach (var opt in Data[position.X, position.Y].Notes)
{
SudokuSolver fork = SudokuSolver.Clone(this);
// Set the guess
fork.Data[position.X, position.Y].Value = opt;
// Try to solve
if (fork.Solve(true))
{
return(fork);
}
}
return(null);
}