there are tons of chess variants. One of the most interesting that I have come over is called 'psychologic' . in psycologic you make a move and your opponent has to say eitger 'yes' or 'no'. If he says 'yes' your move is complete and it's his turn. If he says 'no' then you have to take back your move and make another move. If you don't have another (legal and different from the one you've made previously) you lose. When you make this re-move your opponent can't say 'no'. Then it is his turn and you say 'yes' or 'no'...
What strange chess rules can you think up?

The Two White Rooks are placed on a3 and h3 and the black rooks on a6 and h6. The rooks act as a Wall that prevents immigration or movement for white and black peices.
about 90% of illegal immigrants come by areoplane to america.

Playing chess using a ping-pong table (as the chessboard) that is eight times(!) the size of a normal ping-pong table. The ping-pong table has 64 squares, that are recessed so the chess pieces, which are really various sizes of ping-pong balls, can land in the recessed squares when hit by a ping-pong paddle just right. The queen ball is nine times the size of the pawn balls, while the rook ball is five times the size of the pawn balls. The knight and bishop balls are three times the size of the pawn balls, while the king ball is invisible. I don't know how it could be invisible, but it is. If you are able to serve your balls to your intended coordinates, then you play chess, as per the normal chess rules, but if you mishit a ball, you lose your turn and your opponent gets an extra turn. There must be something I'm forgetting, but I cannot think of whatever that might be right now...

I play strip chess with my girl from time to time. Lose a piece, lose an item of clothing....wrve never finished a game 😉

You could promote to a king and when you do it you have two lives
what happens when two kings are promoted and both king are in check at the same time
They capture one of their kings and now they have only have one life

I've given some thought recently to a variation in which the players make their moves simultaneously. It's a standard game with standard rules but the players write their moves down, then when both are ready, they play them.

At any time, but only once, you may put a piece of yellow fluff on your king. A wall will spring up and any of the opponents pieces on your side of the board will move back past the halfway point to their side. Wall lasts 5 moves, when the mexicans *cough* opponents figure out that they can just fly over said wall. this gives you time to do stuff, or you can just take it down whenever you want. This rule is called the Trump

If you lost a piece then you have to drink one tequila (0,2l), losing a rook there would be on top one beer (0.5l) and losing the queen the beer must be warm.

If you lost a piece then you have to drink one tequila (0,2l), losing a rook there would be on top one beer (0.5l) and losing the queen the beer must be warm.
Hmmm, I think I'd be more worried about losing the beer or the tequila if my opponent were to steal it, than I would be losing a piece...
In a real battle, a commander might think of killing a friendly soldier in case the soldier betrays of acts like a traitor. There may have been a similar rule in chess that I can capture my own piece or pawn if I wish.