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Given that we are experimenting here, probably let's restrict Black from making the extra move with the same pawn. all we want to do here is give Black nearly equal chances of beating White. Re your second point, fine (except that I believe that Black will always have space for an extra move). I suppose in the last stages, Black may be trying for Stalemate.
(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)