Contamination chess
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(i made this up btw) Every square you go from, will disappear, so the game lasts only 32 moves max. All long range pieces can move through the gaps, but not go on it.
Cool idea! Castling is impossible, because to castle you need to move all your pieces out of the way, but those spaces just gets decayed.
#2, absolutely correct in a chatgpt way
I feel like this would end in a stalemate most of the time
Id add a rule that if u premove on a void square, u will lose that piece bc it fell into the void