Some chess variants I made up

• Jailbreak -- If you promote a pawn, one of your captured pieces goes back to the last square it was on. You get to choose which one.
• Advance -- If your king gets to your opponent's rank (8th or 1st), you win.
• Underpromote -- You can only promote into a knight or bishop.
• Triple Threat -- If you get tripled pawns, you win.

If you want, you can post your own variants here!

triple threat seems hard ngl

Oh, that's just the alternative way to win. You can also win by checkmate. Same goes for Advance.

Landmines -- They are invisible pieces. Before the game begins, each player can choose a square on the board to lay a landmine. This position is known only to oneself. When an opposing piece moves to a square with a landmine, it will be captured. When king moved to this sqare, it will be checkmated.

https://www.chess.com/clubs/forum/view/chess-variant-kaddie-booms-tasty-cabbage-and-his-invisible-fireplace-bellows
Someone should try to make something like dis!

how about 3+0 blitz but every capture gives you an extra 15 seconds, also giving extra time is disabled