How Poker Works

How poker works is something you can pick up in ten minutes and then spend years getting good at. This page sticks to the first ten minutes, using Texas Hold’em because it’s the game you’ll find almost everywhere, online and in card rooms. When you want the maths behind a specific hand, the free CasinoCalcs poker odds calculator will run it.

How poker works, one hand at a time

Each player gets two private cards, the hole cards. Before anyone sees them, the two players left of the dealer button post forced bets called the small blind and big blind, say $1 and $2, so there’s always something to play for.

Then there are four betting rounds:

• preflop, with just your two cards
• the flop, three shared cards dealt face up
• the turn, a fourth shared card
• the river, a fifth and final one

On each round you can check (when nobody has bet), bet, call a bet, raise it, or fold and give up the hand. If two or more players are still in after the river, it goes to a showdown and the best five-card hand made from your two cards and the five on the board takes the pot.

Most hands never get that far. Somebody bets, everyone else folds, and the pot goes to the last player standing without a card being shown.

What beats what in poker?

From best to worst: royal flush, straight flush, four of a kind, full house, flush, straight, three of a kind, two pair, one pair, high card. A flush beats a straight because it’s harder to make, and that logic runs right down the list. The poker hand rankings page has every hand with an example and its odds.

The nuts

“The nuts” is the best possible hand given the board. If the board shows four hearts and you hold the ace of hearts, you’ve got the nut flush, and nobody can beat it unless the board allows a straight flush. Knowing whether you hold the nuts, or just a good hand, is a big part of when to put your stack in.

Pot odds: when a call is worth it

Say there’s $30 in the pot and someone bets $10. You’d be calling $10 to win $40, so you need to win more than one time in four (25%) for the call to pay off. A flush draw on the flop with two cards to come gets there about 35% of the time, so here calling is a profitable decision even though you’ll miss most of the time. The pot odds calculator does this on the fly.

What is rake in poker?

In a casino or online room you’re playing against the other players, not the house, so the house takes its cut from the pots instead. That’s the rake, often around 5% of each pot up to a cap. It doesn’t sound like much, but it comes out of nearly every hand, and over a few thousand hands it adds up fast. Rakeback deals hand part of it back; the rakeback calculator shows what one’s worth.

What is GTO poker?

GTO stands for game theory optimal: a balanced strategy that can’t be exploited, whatever your opponents do. Nobody plays it perfectly, but it’s the reference point serious players study, mainly so they know where they’re leaking chips.

What is ICM in poker?

ICM, the independent chip model, turns tournament chips into real prize money. Doubling your stack doesn’t double your expected payout, because the prizes are spread across several places. That’s why near the money, folding a hand you’d shove in a cash game can be right. The ICM calculator puts a dollar figure on each stack.