Lesson 35 [Intermediate] Bet Sizing Theory

Bet sizing isn't just about how much you bet; it's about what options you give your opponent. Use small bets frequently, and large bets occasionally.

Basic Strategy

Adjust your bet size based on board texture, range advantage, and stack depth. The basics are 1/3 pot, 1/2 pot, and 2/3 pot.

Basic Premise: 100BB cash game, 6-max, heads-up pot

The core of bet sizing involves three main points:

• 1/3 pot (small size): Dry boards, when betting frequently, when your opponent folds often
• 1/2 pot (medium size): Standard size, balanced situations, neutral boards
• 2/3 pot (large size): Wet boards, polarized ranges, river value/bluff

There are three reasons why bet sizing is important:

• Small sizes give your opponent good pot odds, so betting frequently carries low risk.
• Large sizes force difficult decisions on your opponent, but the cost of bluffing is high.
• Size and frequency have a trade-off relationship (small and frequent vs. large and occasional).

Practical Application

1. On Dry Boards

Bet 1/3 pot frequently (70-80% frequency). Since your opponent will fold many draws or weak pairs, a small size is sufficient.

2. On Wet Boards

Bet 2/3 pot occasionally (40-50% frequency). Since your opponent will call many draws, protect your hand with a large size and reduce your betting frequency.

3. On the River with a Polarized Range

Bet 2/3 pot or more. Mix in nut value and bluffs to force difficult decisions on your opponent.

4. When Stacks are Shallow (30-50BB)

Consider 1/2 pot or all-in. When stacks are shallow, a large size is relatively less burdensome, so betting big is advantageous.

Thought Framework

When deciding on bet size, it's good to approach it with this framework:

1. What is the board texture? (Dry vs. Wet)
2. What is my range advantage? (Strong vs. Weak)
3. What is the purpose of the bet? (Value vs. Bluff vs. Protection)
4. What is the opponent's calling frequency? (Calls often vs. Folds often)
5. What is the turn/river plan? (Multi-street bet vs. One-shot)

Example Hand Analysis

Example 1: Small Size on a Dry Board

Game: Cash Game 1/2, Stack 200BB
Position: Button
Preflop: Hero raises $6 with A♠K♦ from the Button, Big Blind calls
Pot: $13
Flop: K♠ 7♣ 2♥
Big Blind: Checks

Thought Process:

1. Who is structurally favored on this board?
   → K-7-2 rainbow is a very dry board. My raising range contains many Kx hands, while my opponent's has fewer.
2. What role does my hand play within my range?
   → AK is a top pair, top kicker value hand. However, since the board is dry, the opponent will likely fold often.
3. Does the opponent have enough hands to fold / do they call often?
   → The opponent will fold many middle pairs, ace-highs, and missed hands. A small size is sufficient.

Conclusion: Bet $4 (1/3 pot)

Comment: On dry boards, betting small and frequently is efficient. If you bet a large size, all weak hands will fold, and only strong hands will call, resulting in less value. Extract value from a wide range with a 1/3 pot bet.

Example 2: Large Size on a Wet Board

Game: Cash Game 1/2, Stack 200BB
Position: Cutoff
Preflop: Hero raises $6 with Q♠Q♦ from the Cutoff, Big Blind calls
Pot: $13
Flop: J♠ T♠ 9♣
Big Blind: Checks

Thought Process:

1. Who is structurally favored on this board?
   → J-T-9 two-tone is a very wet board. There are many straight draws and flush draws.
2. What role does my hand play within my range?
   → QQ is an overpair, but the board is dangerous. A protection bet is needed.
3. Does the opponent have enough hands to fold / do they call often?
   → The opponent will call many draws and pairs. Provide bad pot odds to draws with a large size.

Conclusion: Bet $9 (2/3 pot)

Comment: On wet boards, you must protect your hand with a large size. A small size gives draws good pot odds, making it dangerous. Make it mathematically difficult for draws to call with a 2/3 pot bet. Instead, reduce your betting frequency and mix in checks.

Example 3: River Polarized Bet

Game: Cash Game 1/2, Stack 200BB
Position: Button
Preflop: Hero raises $6 with A♠9♠ from the Button, Big Blind calls
Pot: $13
Flop: K♠ 8♠ 3♦, Big Blind checks, Hero bets $4, Big Blind calls
Pot: $21
Turn: 2♥, Big Blind checks, Hero checks
Pot: $21
River: 7♠ (Flush completes)
Big Blind: Checks

Thought Process:

1. Who is structurally favored on this board?
   → Flush completes on the river. A9s is the nut flush.
2. What role does my hand play within my range?
   → Nut value. Opponent might call with Kx or a smaller flush.
3. Does the opponent have enough hands to fold / do they call often?
   → Since the opponent check-called on the flop and turn, Kx or a middle pair is possible. Bet large for value.

Conclusion: Bet $16 (3/4 pot)

Comment: Since you made the nuts on the river, maximize value with a large size. If your opponent has Kx, they might still call on a flush board. A river polarized bet is recommended to be 2/3 pot or more, and bluffs should be mixed in with the same size to maintain balance.

Example 4: Multi-Street Size Adjustment

Game: Cash Game 1/2, Stack 200BB
Position: Button
Preflop: Hero raises $6 with 9♠9♣ from the Button, Big Blind calls
Pot: $13
Flop: 9♦ 6♣ 2♥ (Set)
Big Blind: Checks

Thought Process:

1. Who is structurally favored on this board?
   → 99 is a very strong hand with a set. Since it's a dry board, the opponent will likely fold often.
2. What role does my hand play within my range?
   → Nut-level value. I want to plan to get all the stack in by the turn and river.
3. Does the opponent have enough hands to fold / do they call often?
   → Start small on the flop, then go big on the turn and river. Commit stack over multiple streets.

Conclusion: Flop bet $4 (1/3 pot), Turn $12 (1/2 pot), River $40+ (2/3 pot or more)

Comment: With a very strong hand, you should gradually build the pot over multiple streets. If you bet a large size on the flop, your opponent will fold, so start small and bet big on the turn and river. If you plan to bet all three streets, a ratio of around 1/3 pot on the flop, 1/2 pot on the turn, and 2/3 pot on the river is appropriate.

Key Pattern Summary

Pattern 1: Dry Board → 1/3 pot, high frequency (70-80%)

Pattern 2: Wet Board → 2/3 pot, low frequency (40-50%)

Pattern 3: Neutral Board → 1/2 pot, medium frequency (50-60%)

Pattern 4: River Polarized → 2/3 pot or more (mix value and bluffs)

Pattern 5: Multi-Street Value → Flop small, Turn medium, River large

Pattern 6: Shallow Stacks (30-50BB) → 1/2 pot or all-in

Pattern 7: Size and Frequency Trade-off → Small and frequent vs. Large and occasional

Pattern 8: Opponent folds often → Small size sufficient

Quiz

Question 1
Raise from the Button, Big Blind calls. Flop A♠ 7♦ 2♣ (rainbow, dry). Opponent checks. What is the correct bet size?

A) 1/3 pot (small size)
B) 1/2 pot (medium size)
C) 2/3 pot (large size)
D) Full pot (very large size)

Question 2
Raise from the Cutoff, Big Blind calls. Flop Q♠ J♠ T♣ (two-tone, wet). Opponent checks. What is the correct bet size?

A) 1/3 pot (small size)
B) 1/2 pot (medium size)
C) 2/3 pot (large size)
D) Check (pot control)

Question 3
Raise from the Button, Big Blind calls. Flop K♠ 9♦ 4♣, opponent checks, you bet 1/3 pot, opponent calls. Turn 2♥, opponent checks. You hold K♣Q♦ (top pair). What is the correct turn bet size?

A) 1/3 pot (maintain small size)
B) 1/2 pot (increase size)
C) 2/3 pot (large size)
D) Check

Question 4
On the river, you completed a flush. You bet small on the flop and turn, and your opponent called. What is the correct value bet size on the river?

A) 1/3 pot (small size)
B) 1/2 pot (medium size)
C) 2/3 pot or more (large size)
D) Check (pot control)

Question 5
You have only 40BB left in your stack. You made top pair on the flop, and your opponent checked. What is the correct strategy?

A) Bet 1/3 pot
B) Bet 1/2 pot or all-in
C) Check
D) Pot control with a small bet

Answers and Explanations

Question Answer Explanation Question 1 A) 1/3 pot A-7-2 rainbow is a very dry board. Since your opponent will fold often without an ace, betting small and frequently is efficient. A large size yields less value and increases bluffing costs. Question 2 C) 2/3 pot Q-J-T two-tone is a very wet board with many straight draws and flush draws. You must provide bad pot odds to draws with a large size. A small size allows draws to call profitably. Question 3 B) 1/2 pot When extracting multi-street value, you should start small on the flop and gradually increase the size on the turn and river. Increasing to 1/2 pot on the turn allows you to bet around 2/3 pot on the river. Betting 1/3 pot on the flop, turn, and river will not commit enough of the stack. Question 4 C) 2/3 pot or more Since you completed a nut-level hand on the river, you must maximize value with a large size. As your opponent called on the flop and turn, they likely have something. A river polarized bet is recommended to be 2/3 pot or more, and bluffs should be mixed in with the same size to maintain balance. Question 5 B) 1/2 pot or all-in When stacks are shallow (40BB), betting a large size or going all-in is advantageous. Betting small multiple times can leave awkward stack sizes on the turn and river. With shallow stacks, play simply with a 1/2 pot bet or an all-in.