Adjusting to stack sizes in tournament poker

Late in a tournament, the two players sitting next to you can hold the same hand and still be playing two completely different games. One is a 60 big blind chip leader hunting for spots to apply pressure. The other is a 7 big blind short stack who has already decided he is shoving the next decent hand. Adjusting to stack sizes is the skill of reading what the table looks like through each player's eyes, then choosing the line that exploits his constraints rather than the line that simply matches your cards. The same K-J offsuit is a fold against a stack that covers you on the bubble and a profitable isolation raise against a 4 BB all-in with players still to act. Get this right and you print chips off opponents who are paralyzed by pay jumps. Get it wrong and you hand your stack to the one player at the table who can bust you.

Read the table the way each player reads it

Before you act, run the table through the eyes of the people in the hand. A real endgame table is a patchwork of different stacks and agendas: a big stack looking to bully, medium stacks nursing a cash, short stacks hunting for a shove. Your correct play is a function of who acts after you and what they are afraid of.

• Identify who covers you and who you cover. The stack that can end your tournament deserves caution. The stacks you dominate are targets.
• Read fold equity per opponent, not as a table average. A committed short stack has none to give, while a medium stack near the money is overflowing with it.
• Adjust your opening range to the stacks behind you. If a frequent re-jammer who covers you is left to act, tighten to hands that can comfortably call a shove, because the back half of your opening range only exists to fold to his all-in.

This is the through-line of the entire part: you are playing the table, not just your two cards. Every rule below is a special case of reading how the spot looks to the specific player you are up against.

Playing the big stack: pressure the right people

A big stack is a weapon, but only if you point it at the right targets. The medium stacks near the bubble are where your equity lives, because they fold far too much to protect a cash they can taste. Open into them relentlessly, three-bet the ones who open and then fold, and make them play for their tournament every time they continue. Ease off the players who have nothing left to protect: the committed 5 BB short stack is calling, so there is no fold equity to harvest from him.

When a short stack jams, your math changes. Call short jams wide, because the price is tiny relative to your stack and his shoving range is loose enough that hands like K-9 suited or A-7 are comfortably ahead of it. If players remain behind the all-in, do not flat it. Re-raise to isolate, so you get heads-up with your strong hand instead of inviting a multiway pot where a third stack can outdraw you both and your overlay disappears.

The one stack you respect is the other big stack. Big stack versus big stack, avoid the clash. He is the only player who can cripple you, so do not get involved in a 40 BB pot with a marginal hand and no read. Let him fight the medium stacks too. There are easier chips at the table than the ones in front of the only person who can knock you down to average.

Playing the medium stack: respect ICM and the cover

The medium stack is the most uncomfortable seat at the table, and the players around you know it. Your job is to avoid the medium stack's classic mistake: spewing your cash equity into a stack that covers you. Steer clear of the players who can bust you near a pay jump, and fold marginal hands rather than risk your tournament life when there is no urgent reason to. You do not need to win a flip against the chip leader to ladder. You need to outlast the shorter stacks.

This is where ICM overrides chip-EV. Near a meaningful pay jump, the chips you lose are worth more than the chips you win, because busting costs you real money while doubling up only nudges your equity. The practical consequence is sharp: decline marginal flips you would happily take for chips. A coin flip that is a clear call in a chip-count freezeout becomes a fold under ICM when you are the medium stack one spot off a big jump. Tighten your calling ranges against shoves, sidestep the covering stacks, and let the bubble do your work by busting someone else first.

Playing the short stack: ignore the bubble, take your spots

The short stack has the opposite problem and the opposite solution. The fold pressure that paralyzes the medium stacks is not yours to feel. Ignore the bubble and take your spots. If you sit and fold to protect a min-cash you may not even reach, the blinds and antes grind you into the dust and you bust in the same place anyway, just with no chance of a real finish. A short stack accumulates by shoving, not by surviving passively.

That means jamming your reasonable hands while you still have fold equity left, re-shoving over the habitual stealers, and accepting that your tournament is about doubling up, not laddering one spot. The medium stacks are afraid of you precisely because they are trying to cash, so use that fear. Your shove gets through more often than the raw equity suggests, which is exactly why folding into oblivion is the losing line.

Always read fold equity before you move

Every move in this part lives or dies on fold equity, so check for it before you make any play that needs a fold. The clearest trap is the committed short stack: you cannot bluff a player who is pot-committed. With zero fold equity, a steal attempt is just lighting chips on fire, so against a committed stack you only put chips in with hands you are happy to show down, and you fold the trash you would have stolen against a deeper opponent.

The same logic runs the other way when you size your opens. A re-jammer behind you quietly removes the fold equity from the bottom of your range, so you tighten until the hands you open can withstand the shove you expect. Reading the stacks is reading the fold equity, and fold equity decides whether a given hand is a raise, a shove, a call, or a fold.

Drill the spots

These ideas only become reflexes when you make the decisions under live action, with stacks that punish a lazy read. The nine hands below put you in each seat in turn: picking the right target as the big stack, dodging the stack that covers you, taking your spots as the short stack who ignores the bubble, refusing the big stack versus big stack clash, calling a short jam wide, isolating an all-in, declining an ICM flip near a pay jump, refusing to bluff a committed shove, and adjusting your opens to a re-jammer behind you. Work through them and treat each one as a question of how the table looks to the other player, not just what you hold. Begin the hands and start training yourself to play the stacks, not only the cards.