If a player meets the all in bet, and then folds, BY DEFINITION, s/he was bet out of the side pot by one of the other side pot betters. That's why the player can't win the side pot. Basically, you have to stay in until YOU'RE all in, not just match another (all-in) player. The side pot money is sometimes referred to as “money on the outside.” If multiple players go all in for different amounts during the same hand, it will be necessary for the dealer to create multiple side pots. When this occurs, the dealer must remember which players are in for which pots. This can get confusing, so to help, the side pots.
When a player is faced with a current bet amount that he has insufficient remaining stake to call and he wishes to call (he may of course fold without the need of special rules), he bets the remainder of his stake and declares himself all in. Since player A has only 30bb, the maximum size of the main pot is 90bb for three players (30bb. 3). Player B has 70bb remaining for which he can compete against player C for the side pot. Note that 50bb of player C’s stack cannot be invested because he is only 100bb deep effective with player B. The remaining chips of Player B are then matched to the bet of Player C. Player B has $40 left so we take $40 from Player C and make a side pot of $80. When all matching is done Player C still has $150 left in his bet. This money is returned to Player C immediately. Then the remaining cards are dealt and the showdown is performed.
A tie goes to the runner in baseball, but a tie in poker results in a split of the pot. Just what constitutes a tie can be confusing. Before you join a Sit-n-Go or play live poker you should brush up on what constitutes a tie, so let's look at some examples.
Is this a Tie at Texas Hold'em?
Suppose there are two players left in a pot. The five community cards showing on the board are 2, 3, 4, 5 and 6, two clubs, two hearts and a diamond. Player 'A' turns over their starting hand and shows a 3 and 4. He had two pair before the river, but now the board is a straight.
Player 'B' turns over their cards and shows a King and a Queen of clubs. They had four clubs and missed the flush on the river. So, who wins?
In Texas Hold'em, the highest combination of five cards wins the pot. So, regardless of the fact that player 'A' had two pair or that player 'B' had higher cards, the best five cards are the straight of 2-3-4-5-6, and since the game includes five community cards available to every player still in the pot, both players will use all five cards on the board to make the same hand, a 6-high straight. Thus, this hand becomes a split pot.
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Poker Side Pot Folding
Of course one of the players may bluff at the pot, trying to convince the other that they hold a 7 or even a 7-8 and a higher straight. That's just advanced play and not much you can do about it.
Another Tie Example
Suppose three players call pre-flop, which shows 6-6-8. Player 'A' has pocket aces and bets, called by player 'B' who holds Ace-King suited and a four-flush, and player 'C' who flopped four to a straight. The betting is heavy. On the turn, another 6 hits the board. Now player 'A' has sixes full of aces, player be still has a 4-flush, and player 'C' folds.
The river is another 6, leaving a board of 6-6-8-6-6. Now the best hand is quad 6's with an ace, and both players remaining split the pot. Bummer for player 'A' who's full-house dominated on the turn, but turned into a split on the river!
When Kickers Play
In the last example, both players used their Ace-kicker to claim a split of the pot. Other times kickers can be even more confusing. Suppose the final board is all spades: Ace-K-6-5-4
Player 'A' has two spades in their hand, Jack and 6. Player 'B' has a pair of queens, one of which is a spade. In this case, player 'B' wins because their final hand of Ace-K-Q-6-5-4 spades is higher than player 'A's' hand of Ace-K-J-9-8 spades.
Side Pots Poker
If the players had each held just a single spade in their hand, player 'A' the 2 and player 'B' the 3, this would be a split pot, as the final community cards of Ace-K-6-5-4 would be the highest hand. You'll start to understand these concepts quickly as you learn more advanced strategies.
One Last Example
Now suppose there is an all-in wager preflop and two players call. Player 'A' holds pocket Jacks and player 'B' hold's pocket Tens. The board comes Ace-King-Queen. Player 'A' leads and both have a straight draw. The turn is an Ace and the river is another King, for a final board of:
Ace-King-Queen-Ace-King
Poker Side Pot Rules
Looks like player 'B' caught-up! Now it's a tie because the board plays and those pocket jacks and tens aren't going to be used! It's simply two-pair (Aces and Kings) with a queen kicker!