What makes Chess Variants a chess variant?

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Avatar of ChezzTaker

I know that It's not a normal chess but is there like a rule about structure of the game or something that can tell it's some kind in a chess variant?

Avatar of evert823

Put differently, how much do we need to stretch our definition or notion of "chess variant" so that, say, sudoku and poker are chess variants?

Avatar of ChezzTaker

Sorry, I was drunk when I write that and totally forgot lol so what I meant is that What is the scope of chess variants and what elements they have to make them different from regular chess?