ICM Postflop in Tournaments
Basics
- ChipEV — goal: maximize chip count.
- ICM (Independent Chip Model) — goal: maximize $EV (monetary value of chips).
- Even perfect ChipEV play can lose up to 30% of a buy-in in 3-bet pots on the bubble or final table.
- 💡 Chips are not money, but a means of “survival” in a tournament.
Reward for Risk and Bubble Factor
Definitions
- Reward for Risk = difference between ChipEV and ICM EV.
- Bubble Factor = risk of losing EV / reward of winning EV.
| Situation | Bubble Factor |
|---|---|
| ChipEV | 1.0 |
| Tournament bubble | 1.5–2.0+ |
Pressure Dynamics
- ICM pressure starts increasing at ~25% of the field remaining until the bubble.
- Maximum pressure: bubble, final table.
- Decreases towards HU (final heads-up).
Postflop Adjustments for ICM
Key Principles
- 💣 Bluff more (ICM ➤ aggressor has advantage).
- 🛡 Fold more (opponent under bust-out pressure).
- 🔹 Smaller sizings ➤ fewer incentives to call.
- 🔄 Lower variance lines ➤ more stable $EV.
Example Mini-Game (3 players, 2 tickets)
| Scenario | ChipEV (bluff %) | ICM (bluff %) | MDF (call %) |
|---|---|---|---|
| Player in position | ~45% | ~64% | - |
| Player out of position | ~17% | ~10% | ~16.7% / ~10.3% |
ICM ➤ aggressor can bluff more, opponent calls less.
EV Leakage in Tournaments
- EV gain ≠ EV loss.
- Example: you bust a player → win $698 EV, but $514 (42%) leaks into the field.
- Leakage increases with stack imbalance.
- Covering player ➤ has “risk advantage”.
Downward Drift
- Concept: solvers choose smaller bets to reduce variance.
- Example: ⅓ pot is more common in ICM decisions than in ChipEV.
- 💬 Even a shove can be lower variance than a small 3-bet.
GTO Wizard Example
- 📍 Comparing ICM vs ChipEV decisions on K87ss board.
- ICM: dominated by ⅓ pot bets.
- ChipEV: balance between ⅓ and ⅔.
- GTO accounts for stack coverage, tournament phase, and payout structure.
Useful Resources
- 🎥 ICM visualization
- 🎥 5 tips from Oston Obrezkov
- 🎥 Theory of Risk Advantage — Hunt
- 📈 Auto-generator for reward-for-risk graphs for different tournaments
Conclusions
- ICM pressure affects frequencies, sizings, aggression, and passivity.
- Ignoring ICM postflop ➤ loss of $EV.
- The closer to the bubble or final table, the more important ICM adjustments become.
Tags: #ICM #MTT #postflop #EV #EVleak #bluff #variance
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