Bankroll

A bet with a stated edge. How much of your money do you stake? As many as you can in 60 seconds, each one scored the moment you answer.

How it works

1. Each round shows a bet: its win chance and what a win pays. Slide to the share of your money to stake.
2. You score how fast your stake grows your money in the long run, against the best stake: 10, 5 or 2 points.
3. Rounds get harder as you improve: other odds, long shots, heavy favourites and bets with no edge.

It trains sizing bets (the Kelly rule). After every round you see the best answer and why.

Play bankroll

Play with friends or a club

Challenge a friend with a duel link, or run a tournament for a club or class: one link, the same rounds for everyone, one run each, and a live leaderboard.

Also try Bluff the bot, or the probability puzzles.