Great Maurice,
so,
Regulra Sudoku =Vanilla
Vanilla + Girandola group = Girandola
Vanilla + 2 main diagonals = SudokuX
Vanilla + 4 windows (r234678c234678) = Windoku
Vanilla + 4 windows (r234678c123789) or (r123789c234678) = Windoku2
Windoku + girandola = Gwindoku
Windoku2 + girandola = Gwindoku2
I have only xy-wing & xyz-wing left to be added to the solver to bring it up to minimum standards....
I have now on ....
Singles
Subsets
Fish
tarek