/// <summary>Reduced a cell by excluding the options of the other.</summary>
public IEvent And <TSolver>(int index, uint mask)
{
unchecked
{
var val = m_Values[index];
var nw = val & mask;
m_Values[index] = nw;
if (nw == SudokuPuzzle.Invalid)
{
throw new InvalidPuzzleException();
}
if (SudokuCell.Count(nw) == 1 && SudokuCell.Count(val) != 1)
{
return(ValueFound.Ctor <TSolver>(index, nw));
}
return(val != nw ? ReducedOption.Instance : (IEvent)NoReduction.Instance);
}
}
protected virtual void OnValueFound(RcdFndEventArgs e) => ValueFound?.Invoke(this, e);