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Probability before intuition

Understand games and their mechanics

A possible result is not necessarily a likely result. Rules, house edge, variance and independence help explain why short-term impressions can be misleading.

Cards, chips and a notebook used to explain probability
Cards, chips and a notebook used to explain probability

8 detailed illustrated guides

Read the full rules, step by step

Poker, blackjack, roulette, slots, baccarat, craps, sports betting and racing: play sequence, payments, variants and mathematical risk.

See all rules

Random does not mean fair

A game may be random while still giving the operator a mathematical advantage through payouts or rules.

RTP is a long-run measure

A published return percentage is calculated across a very large volume of play. It predicts neither the next spin nor one person’s result.

Betting systems do not remove the edge

Changing stake sizes can change volatility and the speed of losses, but not transform negative expectation into a reliable investment.