When you make your first move you start by laying down an opening marker (ante). Then you lay down your challenge which is 1-5 markers. Then you make your move.
The other player then starts by laying down the obligatory opening maker. After that he has to answer your challenge and put down the equal amount of markers you used to challenge. That is followed by his/hers challenge, again ranging from 1-5 markers, which you have to answer the next time.
White: 1 opening 2 challenge Pot = 3 Black: 1 opening 2 answer 0 challenge Pot = 6 White: 1 opening 0 answer 2 challenge Pot = 9 Black: 1 opening 2 answer 2 challenge Pot = 14As you can see the pot goes up rather quickly and thus it might be a nice idea to keep the challenges low or nothing at the beginning of the game.
This sort of betting leads to many games ending with resigning when you feel you are loosing a game and thus adding the need of a poker face or perhaps we should call it Ďchess faceí.
To raise the bets you can raise the cap of a challenge. We have successfully mixed this system with many Chess variants including multiplayer variants.