If I had to play variants, I do not enjoy disallowing knight moves, etc. That simplicity-flexibility is what gives the game the large number of results per ply, and also taxes the calculation powers of the players.
I would be amused to see a "double-start" variant that gives players both corner pieces and near-middle pieces so that the chaos can begin immediately.
I also came to appreciate how the blocked squares alter the game boards.
(gem) Hvis du venter på din tur kan du klikke på "ændre" ved siden af "Opdater" på hovedsiden, sætte "Automatisk opdaterings-interval på hovedsiden og spilsiderne" til 30 sekunder. Så får du vist din tur hurtigere. (Servant) (vis alle tips)