Setup
2 to 9 players. Each player gets 2 hole cards. Five community cards (flop 3, turn 1, river 1) are dealt face up.
Play of a hand
Pre-flop, flop, turn, river. Actions: fold, check (when no bet), call, bet/raise, all-in. Big blind is twice the small blind.
Showdown
Best 5-card hand of (hole + community) wins the pot. Standard rank order: high card < pair < two pair < trips < straight < flush < full house < quads < straight flush.
Settlement
Pot goes to the winner; 10% platform fee. ELO is updated per hand based on stack swings.