Single Comment

No, there can be smaller Chess on 1 square, which equals no square. It was already discussed how piece-types alone and sub-modes of them can mutate competitively, ready and able to delineate whose advantage. The class can be designed non-trivially, not like some Rock-Scissors-Paper. Also there may not be a spatial but only temporal arrangement. Battle Chieftain has only one piece-type and it is still Chess, as do couple of others, but Chieftain has two modes. Conway's Angel leaps to any square, as does the Missile Flowerman reused, and so against some mixes none of the other squares would matter against Angel, and the whole game is tempo, by thinking of and planning it all as just one square, or space accurately.