If FIDE would legitimate a variant with a veto mechanism (e. g. the duck from Duck Chess)

They would have to guide restrictions so that players could still win quickly. If you can veto any move you want, there is no “Fool’s Mate” because, for example, White just vetoes Qh4 with pawns on f3 or f4 and g4 and a Black pawn on e6 or e5.

I'm sorry, I don't quite understand what you mean. That's probably on my part because I don't know all that much about FIDE regulations and rules. Does the veto move basically mean that you can make an opponent take back their own move?

This is the forum on Veto Chess I made over in the custom variant club

https://www.chess.com/clubs/forum/view/veto-chess-suggestion?quote_id=88677623&page=1#comment_box

I think that's what @josephruhf is referencing

Ah ok, that explains why I thought it sounded odd.

Looks like a cool variant!

For certain variants like Duck Chess, I agree it would have some issues.

I actually use Duck Chess as my example and Duck Chess has no way to veto captures from neighbouring squares or Knights.

which is sort of the point of the game...? already makes it way more complex as it is

I am confused what this means. Can anybody tell me?

ask mgleason