A side pot in poker is the pot created when one player goes all-in for fewer chips than the rest and the hand continues among the players who still have a stack. It is the rule that starts the most arguments at a home game and gives away the most chips in a club app, because a player who does not know how it is split does not know how to play it either. Here it is, with numbers.
The rule that explains everything
A player can only win from each opponent the same amount they put into the pot. Nothing more. If you go all-in for 300 chips, you can win at most 300 from each of the others, even if they have 1,500 in front of them. Anything they bet above your amount goes into a separate pot you are not part of: that is the side pot.
The main pot is contested by everyone, including the short all-in player. The side pot is contested only by those who kept putting chips in.
Example with one all-in
Ana has 300 chips, Bruno and Carla have 1,200 each. Ana goes all-in preflop for 300, Bruno and Carla call.
Main pot: 300 × 3 = 900. All three compete for it.
On the flop, Bruno bets 400 and Carla calls. Those 800 chips form the side pot. Ana can no longer bet or win anything from it; Bruno and Carla keep playing the turn and river against each other with their remaining chips.
At showdown, if Ana has the best hand of the three, she wins 900 and nothing else. The 800-chip side pot goes to the better hand between Bruno and Carla, even if that hand loses to Ana's. If Bruno has the best hand at the table, he takes both pots: 1,700.
Example with two all-ins
This is where home games fall apart. Ana has 300, Bruno 700, Carla and Dani 1,500. Ana goes all-in for 300, Bruno goes all-in for 700, Carla and Dani call 700.
Main pot: 300 × 4 = 1,200, for all four.
Side pot 1: the 400 chips Bruno put in above Ana, matched by Carla and Dani, 400 × 3 = 1,200. Bruno, Carla and Dani contest it.
If Carla and Dani keep betting afterwards, say 500 each on the turn, side pot 2 is created: 1,000 chips for the two of them only.
Order of awarding at showdown: always from the last pot to the first. Side pot 2 first (Carla against Dani), then side pot 1 (Bruno, Carla and Dani), and finally the main pot (all four). A player can win side pot 1 and lose the main pot. That is normal, and it is correct.
If two players tie within a pot, that pot is split between them like any other split pot; the remaining pots are resolved separately.
How it is counted live (and why online you do not need to worry)
In an app or online room the software calculates the pots instantly. At a physical table, the dealer or host separates the main pot the moment the short all-in happens, before action continues. Two rules for your home poker tournament: the all-in player shows their cards at showdown even when losing, and whoever deals announces "side pot" every time one is created. It saves half an hour of arguing per night.
The strategic decision: the dry side pot
Now the part that actually costs chips. Picture this: the short stack goes all-in, you and another player call, and on the flop nobody has bet yet, so the side pot is empty or close to it. Here most players make the same mistake: they bluff.
Think it through. A bluff works because the opponent can fold. The all-in player cannot: they are seeing the river no matter what. If you bet with nothing and the other live player folds, all you have done is remove the only opponent who could fold, leaving you against the short stack with zero fold equity. Mentor-King rule: into a dry side pot, bet for value only. Without value, check and let the short stack play out their equity.
With a strong hand, on the other hand, betting into the side pot pays twice: you win chips from the other live player and, in a tournament with ICM at stake, your hand reaches showdown anyway to eliminate the short stack.
What you never do is agree with the other player to "check it down". Everyone decides alone. Checking it down by your own judgment is fine; arranging it is not.
Common mistakes
Believing the short all-in player can win everything on the table. Forgetting that against two opponents the SPR changes depending on who you face in each pot. Calling a short all-in with a weak hand "because it is cheap" and then continuing against the big stack. And bluffing into dry side pots, the classic.
The lesson
The side pot is not a rulebook curiosity: it is a reminder that you only win from each opponent what you risked against them. Understanding the split saves arguments; understanding the dry side pot saves pointless bluffs, the ones that burn the most chips in three-way pots.
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