Bet sizing là một trong những variables quan trọng nhất trong poker decisions. Quá nhỏ = không charge đủ draws, quá lớn = mất value khi opponents fold too wide. Đây là guide về các sizing phổ biến, ý nghĩa của mỗi loại, và khi nào dùng.
Các Bet Sizing Phổ Biến
Min Bet (1BB / Minimum)
Định nghĩa: Smallest legal bet — 1 big blind preflop hoặc amount equal to last bet post-flop.
Khi dùng:
- Rarely in standard strategy
- "Blocker bet" khi OOP và want information cheaply
- Sometimes by beginners as default (mistake)
Issue: Too small = almost every opponent will call → no fold equity.
Small Bet (25-33% pot)
Định nghĩa: Bet 1/4 đến 1/3 size của pot.
Khi dùng:
- Dry board, range advantage (all bets profitable)
- IP player extracting thin value
- Merged range strategy
- Want opponent to call wide (thin value)
Effect: High call frequency, small pots, good for extracting from many hands.
Medium Bet (40-60% pot)
Định nghĩa: 40%-60% của pot size.
Most common sizing range. Balance between fold equity and value.
Khi dùng:
- Standard c-bet sizing
- Value bet with medium hands
- Most flop situations
- When uncertain, this is often reasonable default
Effect: Balanced — folds weak hands, gets called by medium/strong hands.
Large Bet (66-75% pot)
Định nghĩa: 2/3 đến 3/4 pot.
Khi dùng:
- Wet boards (charge draws)
- OOP c-betting (need fold equity)
- Strong value hands (set, two pair+)
- River value betting strong hands
Effect: Higher fold equity, smaller call frequency, bigger pots when called.
Pot Bet (100%)
Định nghĩa: Bet equal to entire pot.
Khi dùng:
- Strong protection needed (set on wet board)
- River value betting (willing to fold out medium hands)
- Large bluffs with story + blockers
- Shoving on river with polarized range
Effect: High fold equity, fewer callers, bigger pots.
Overbet (125%+ pot)
Định nghĩa: Larger than pot size.
Khi dùng:
- Nut hands wanting maximum value on dry boards
- River bluffs with perfect story + blockers
- When range advantage is extreme
Effect: Very high fold equity OR maximum value from callers who can't fold.
Sizing By Street
Preflop Sizing
Open raise: 2-3x BB is standard (2.5BB very common).
Too small (1.5BB): Field calls wide → difficult post-flop. Too large (4-5BB): Miss value; players fold mediocre hands that would've paid off.
3-bet sizing: 2.5-3x the open.
IP 3-bet: Smaller (2.5x) — position advantage compensates. OOP 3-bet: Larger (3-3.5x) — needs to make calls more expensive.
4-bet sizing: 2-2.5x the 3-bet.
Limping vs. raising: Never limp from EP/MP (usually). Raise or fold.
Flop Sizing
Most common: 33-55% pot
Small (25-33%): Dry boards, range advantage, thin value. Medium (45-55%): Most boards, balanced approach. Large (66-75%): Wet boards, OOP bets, strong hands.
Turn Sizing
Generally larger than flop:
If flop 40% → turn typically 55-66%.
Why larger? Pot is bigger; remaining stack smaller; draws need charging.
Polarized turn: Can use 75-100% with strong hands or as bluffs.
River Sizing
Widest range of sizing by situation:
Thin value (marginal hand): Small-medium (40-55%) — want calls from wide range. Strong value: Large (66-100%) — want maximum from strong second-best hands. Bluffs: Depends on fold equity needed:
- Low-medium if opponent calls wide
- Large-overbet if opponent folds wide
River is where sizing matters most — no more streets to react.
Sizing And Polarization
Key relationship:
Larger bet → More polarized range is correct
Why? With large bet:
- Opponents call less (only strong hands)
- You're getting called by strong range
- Medium hands lose value in large pots
- → Value only with very strong, bluff only with blockers
Smaller bet → More linear/merged range works
Why? With small bet:
- Opponents call wide
- Even marginal hands can extract value
- → Can include medium hands for thin value
Multiple Sizings (Two-Bet-Size Strategy)
Advanced: Using two different sizes on same street based on hand category.
Example: River with polarized range
Strong value (set+): Bet 100% pot Thin value (top pair): Bet 50% pot Bluffs (missed draws): Bet 100% pot (same as strong value — polarized)
Opponent: Can't easily distinguish strong value from bluff (both bet large) but knows thin value bets medium.
This creates difficult situation for opponent: Large bet = fold if they're calling station on medium hands.
Adjusting Sizing To Opponents
vs. Calling Stations
Call everything regardless of size → use larger bets for value (extract maximum from their calling habit).
Don't reduce size hoping they'll call — they call anyway. Size up for more money.
vs. Tight/Folding Players
Fold often to large bets → use larger sizes as bluffs (high fold equity).
For value: Must use medium/smaller sizes to get them to call.
vs. Aggressive/Raise-Happy Players
Frequent raisers → check more, bet smaller when betting (less to lose if raised).
Don't bet large into raise-happy player unless you want to go to war.
Common Sizing Mistakes
1. Same Size For All Hands
Bet $50 with set AND bluff → opponents who pay attention can detect patterns.
Fix: Vary sizes across range (or mix sizes for same hand type).
2. Sizing Based On Hand Strength (Tells)
Classic beginner tell: Small bet = weak (scared of getting raised), Large bet = strong (scared of missing value).
Opponents learn this → call small bets with everything → fold to large.
Fix: Mix sizes across your entire range. Large bets with bluffs too.
3. Not Adjusting To Board
Same 50% pot bet regardless of board wetness.
Fix: Dry boards = smaller; wet boards = larger. Learn to adjust.
4. Forgetting Stack Depth
If effective stack is 30BB and you bet 15BB on flop → SPR extremely low → committed with worse hands.
Fix: Consider SPR when choosing bet size. Large bet + shallow stacks = potential commitment.
Quick Sizing Reference
| Situation | Suggested Size |
|---|---|
| Open raise | 2-2.5x BB |
| 3-bet (IP) | 2.5x raise |
| 3-bet (OOP) | 3-3.5x raise |
| C-bet dry board | 25-40% pot |
| C-bet wet board | 55-75% pot |
| Value river (thin) | 40-55% pot |
| Value river (strong) | 66-100% pot |
| Bluff river (w/blockers) | 75-150% pot |
| Overbet (extreme spots) | 125-200% pot |
Kết Luận
Bet sizing is a skill that develops over thousands of hands and thoughtful study.
Start with default medium sizing (45-55%) and adjust from there:
- Smaller: Dry boards, range advantage, thin value, IP extraction
- Larger: Wet boards, OOP bets, strong value, big bluffs
Never size based on "I want them to call this" or "I want them to fold" with specific hand — size your entire range such that all hands benefit from the chosen size.
Master sizing and you'll extract maximum value and fold equity in every situation.