About

This is a tool for running probability experiments. You set the assumptions, and it computes what follows from them — exactly where that is possible, and by simulation where it is not. Bankroll survival is the first experiment; the engine underneath is general.

What this is not

It is not a casino, a betting service, or advice. It does not recommend anything. No betting system on this site improves the odds of anything, because no betting system can: the expected value of a wager depends on the probabilities and the payout, and how you size your bets does not change either. This tool exists to make that visible rather than to obscure it.

Results are simulations of a stated model. They describe what the model implies, not what will happen at any real table.

If gambling is causing harm

How every figure on this site is computed