Effective Stack Size Tutorial
What is Effective Stack Size?
Effective stack size is the smallest stack between players in a hand. It defines the maximum amount that can be won or lost.
Why is Effective Stack Size Important?
- Determines the maximum risk in a hand.
- Affects post-flop decision-making and betting strategies.
- Key to calculating Stack-to-Pot Ratio (SPR).
How to Calculate Effective Stack Size?
The effective stack size is the minimum stack among the active players in the hand.
Formula:
Effective Stack = min(Hero Stack, Villain Stack)
Example Calculation
| Player | Stack (BB) |
|---|---|
| Hero | 100 BB |
| Villain | 50 BB |
The effective stack size here is 50 BB, as the Villain has the smallest stack.
Deep vs. Short Effective Stacks
Deeper stacks (100+ BB) allow for more complex postflop play and speculative hands like suited connectors. Short stacks (under 30 BB) force tighter ranges and push/fold decisions.
Tip: Adjust your strategy preflop based on the shortest stack at the table.
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Start Effective Stack ExercisesFrequently Asked Questions about Effective Stack Size
Yes. If chips are added or removed (e.g.,
all-ins or side pots), the effective stack updates dynamically.
Effective stack is the smallest stack
involved, while SPR compares that stack to the pot size to guide postflop aggression.