private static Covers UncoverDeep(
this Covers covers,
MineField mineField,
Point point)
{
if (!covers.IsCovered(point))
{
return(covers);
}
if (!mineField.IsEmptyAt(point))
{
return(covers.Uncover(point));
}
return(point
.Neighbours(mineField.Size)
.Aggregate(
covers.Uncover(point),
(current, neighbor) => current.UncoverDeep(mineField, neighbor)));
}
