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ICM Fundamentals

How prize pools change optimal play

What Is ICM?

The Independent Chip Model (ICM) is a mathematical framework that converts your tournament chip stack into a dollar value based on the prize pool structure. Unlike cash games where every chip is worth the same amount, tournament chips have diminishing marginal value — the more you have, the less each additional chip is worth.

This is because winning all the chips doesn't win you all the prize money — it only wins first place. Doubling your stack doesn't double your equity in the tournament. Understanding this fundamental concept changes how you should approach every decision near the money and at final tables.

Key Insight: In a cash game, risking

00 to win
00 is a breakeven proposition. In a tournament, risking 10,000 chips to win 10,000 chips is a losing proposition in dollar terms because the chips you risk are worth more than the chips you gain.

Diminishing Chip Value

To visualize diminishing chip value, consider a simple example: a 3-player sit-and-go with prizes of $50, $30, and

0. All three players start with 1,000 chips (3,000 total).

ICM Value Example (3-Player SNG)

1,000 chips33%$33.33Equal stacks at start
2,000 chips67%$56.67Double stack ≠ double value
3,000 chips100%$50.00All chips = 1st prize only

Notice: going from 1,000 to 2,000 chips gains

3.34 in equity, but going from 2,000 to 3,000 loses $6.67 in equity (from $56.67 to $50.00).

In a tournament, you double your chip stack. What happens to your dollar equity?

Bubble Factor

Bubble factor measures how much more costly losing chips is compared to winning them. It's the ratio of the equity you lose by busting versus the equity you gain by doubling up. A bubble factor of 2.0 means losing all your chips costs twice as much as winning the same amount gains.

Bubble factor is highest when you're near the money bubble or at a final table with large pay jumps. In these situations, survival matters enormously because each elimination increases everyone else's equity.

Bubble Factor 1.0 (Cash Game Equivalent)

Chips gained and lost have equal value. Play as you would in a cash game. This occurs early in tournaments when the bubble is far away.

Bubble Factor 1.5-2.0 (Near the Bubble)

Losing is significantly more costly than winning. Tighten up with medium stacks. Avoid coin flips and marginal spots. Fold more often in close decisions.

Bubble Factor 3.0+ (Final Table Bubble)

Extreme ICM pressure. Only play premium hands for your stack. Short stacks should wait for other players to bust. Medium stacks face the most pressure — big stacks can bully them relentlessly.

ICM Decision-Making

ICM should influence every decision near the bubble and at the final table. Here's how different stack sizes should adjust:

Big Stack Strategy

  • - Apply pressure to medium stacks
  • - Raise and re-raise liberally
  • - Avoid clashing with other big stacks
  • - Exploit medium stacks' ICM fear

Medium Stack Strategy

  • - Play tighter than chip-EV suggests
  • - Avoid marginal all-in situations
  • - Target short stacks when possible
  • - Fold strong hands if risk outweighs gain

Short Stack Strategy

  • - Look for good spots to shove
  • - Let medium stacks battle each other
  • - Survival has massive equity value
  • - Every elimination bumps your pay

General ICM Rules

  • - Never risk your tournament on a flip
  • - The closer to the money, the tighter you play
  • - Pay attention to other players' stack sizes
  • - Fold more hands than you think you should

You're on the money bubble with an average stack. A big stack raises, and you have pocket jacks. What should ICM tell you?

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Overbetting & PolarizationBubble & Final Table Play