ICM

Five players left, top four get paid. The short stack, 12bb, shoves from the cutoff. It folds around to you in the big blind with A-9 offsuit and 25bb, second shortest at the table. On chips alone it's an easy call: a 12bb shove is wide, your equity is fine, and in a cash game you snap it off. But one player busts before the money, and if that's you, you leave the min-cash behind, a payout jump worth far more than this pot. So you fold. The big stack in the small blind, with nothing to gain from the variance, folded ahead of you for the same reason.

That's the edge ICM gives you: a call that prints in chips can lose money in dollars, and it cuts both ways. Big stacks lean on it, shoving over the medium stacks near the bubble because those stacks have the most to lose by busting before the money. The pressure forces folds you'd never get in a cash game.

The letters stand for Independent Chip Model, and the model does one job: it converts stacks into money. Every stack maps to a probability of finishing first, second, third; multiply those through the payouts and each stack gets a dollar value. The output has a sharp edge: chips you win are worth less than the chips you risked to win them. Double 25 big blinds to 50 and your share of the prize pool grows by well under double, because the new chips mostly improve finishes you were already likely to reach. That gap is the risk premium: an all-in near a pay jump needs more equity than the chip math says, sometimes far more.

How much more depends on the payout landscape. Satellites turn the dial all the way up: when every remaining seat pays the same ticket, a stack that coasts into the money has no hand worth playing, and folding aces preflop stops being a bar story and becomes the correct play. Final tables with big jumps run hot too. It turns the other way as payouts flatten: deep in the money with small steps ICM fades, and in winner-take-all formats, heads-up for the trophy, or any cash game, it's gone entirely: a chip is just a chip again.

The common mistake is playing the bubble like chip-EV poker, snap-calling a good hand because "it's ahead," without checking who else is left and how short they are. ICM depends on the whole table, not your stack alone. Your equity in the prize pool shifts with every stack still in, and the shortest one changes what everyone else should be doing.