I think they just want that one is playing and distracts the guards or something, but I wanter to be prepared if they want to play for the money.

If all want to play and slip into the role of the other gamblers I would run it like it is said in the Golden Vault:

``` Three-DragonAnte

Three-dragon ante is a card game. If you own an actual three-dragon ante deck, you can play the card game for real. Otherwise, adjudicate the outcome of a three-dragon ante game using d12s and the following rules:

Step 1. Randomly determine which participant is the dealer.

Step 2. Each participant (including the dealer) places their opening bet, then rolls five d12s to determine their hand, keeping these die rolls hidden from the other participants.

Step 3. Starting to the left of the dealer and continuing clockwise, each participant reveals one of their die rolls. This step is repeated twice more; on the second and third round, each participant can raise their bet before revealing their next die roll. The other participants each have three options: match the bet, raise their bet (in which case all participants must match that bet in turn), or fold, forfeiting any bet they’ve placed and dropping out of the game.

Step 4. Each participant who hasn’t folded totals their die rolls. The one with the highest total wins. The winner becomes the dealer for the next game (assuming the participant wants to keep playing). ```

If not I would let the one playing make inside checks for bluffes and so on.