Single Comment

If I understand the up-to-date rules of Hyperchess4 right, a K & two Bs can force mate vs. a lone K. It is pleasing that this is the case in Hyperchess4, since in the classic Raumschach (a mere 3D, as opposed to 4D, variant) there doesn't seem to be any forcible 'basic' mate in the case of K & any combination of 2 pieces (excluding Qs or Ps) vs. a lone K. 

On the other hand, it could take getting used to that a K & Q can't seem to force mate vs. a lone K in Hyperchess4. Plus, as in most (if not all!) 3 or 4D variants, it seems that a King & Pawn vs. King wouldn't win nearly as often as it would in standard chess (in the case of Hyperchess4, I suppose it would quite rarely be a win, given that a K & Q cannot seem to generally force mate, at least unless the lone K is already "Held" by the superior side's K in the same 'big square').

Still, given that at least some 2-piece combinations can force mate vs. lone K in Hyperchess4, all it might take is to be just 2 pawns ahead in material to often win a game with good play thereafter, and this does not necessarily require that the opponent always play that badly before that stage. On this count alone, I'd think that Hyperchess4 is a pretty decent 4D variant.