it would have to be like Kung Fu Chess where instead of being turned base it relies on individual piece cooldowns and quick thinking. with a multitude of players on a large map i think it should probably be point based instead of focusing on checkmate, using the general rules of material (pawns being worth 1 material all the way to queens being 9 material).
i think bishops and other pieces should all have a limited range of how far you can go at once. can you imagine playing a very close match (it being cooldown based it would probably be a lot higher adrenaline) with someone and seeing someone starting to close in on you to vulture the aftermath?
edit i think your pieces should be tethered to a max radius around your king? thatd probably be interesting and balance it some
why am i nerding out about this and wishing I could make this a real thing lol
I was thinking just king takes king. Which is not something you would usually see. So black is already in checkmate before white even moves. Though white is also in checkmate.