Cutoff (CO) Core Advantages

The Cutoff (CO) is located to the right of the Button (BTN) and is one of the last positions to act preflop. Since only the BTN, Small Blind, and Big Blind remain to act after the CO, the CO has strong leverage:

• Steal Opportunities: Blind players typically hold wider ranges, allowing the CO to raise aggressively with a wider range, forcing the blinds to fold.
• Position Advantage: If the CO raises and the BTN calls, the CO will be out of position postflop (since the BTN has last action). However, if the blinds call, the CO is in position. Overall, the CO's postflop position is slightly above average.
• Range Diversity: The CO can play tight like an early position or loose like a late position, depending on opponents and stack depth.

Standard CO Opening Range (No Opponent Information)

The following is a typical GTO (Game Theory Optimal) CO opening range for standard stack depth (~100 BB) with no special dynamics. This range represents approximately 20-25% of all starting hands.

Value Raise Range (~10%):

• All pairs: 22+
• ATo+, KTo+, QJo+ (suited & offsuit)
• A2s+, K9s+, Q9s+, J9s+, T8s+, 98s, 87s, 76s

Mixed Range (~12%):

• Some medium suited connectors: 65s, 54s, 43s (~40% frequency)
• Some suited aces: A2s-A5s (~70% frequency)
• Some offsuit Kings: K9o, K8o (~30% frequency)
• Some suited Queens: Q8s, Q7s (~20% frequency)
• Some offsuit Queens: QTo (~50% frequency)
• Some small suited connectors: J8s, T7s, etc. (low frequency)

Suggested Simplified Range (Beginner-Friendly):

• Raise: All pairs, all aces, all suited hands with face card ≥9 (K9s+, Q9s+, J9s+), offsuit connectors KT+, QT+, JT, and suited connectors T9s, 98s, 87s, 76s, 65s.
• Raise Frequency: Approximately 22% of starting hands, i.e., {22+, A2s+, K9s+, Q9s+, J9s+, T9s+, 98s, 87s, 76s, 65s, ATo+, KTo+, QTo+, JTo}.

Dynamic Adjustment Factors

In real games, the CO opening range must be adjusted dynamically based on the following factors:

1. Tightness/Weakness of Blind Players

• Blinds Too Tight (Fold Too Much): Expand your range, increase steals. Add more small pairs (e.g., 22-55), suited connectors (54s, 43s), and even some offsuit connectors (K9o, Q9o).
• Blinds Too Loose (Call/3bet Too Much): Tighten your range, play only strong hands, and consider increasing your 4-bet range. Reduce small pairs and speculative hands.

2. Button (BTN) Style

• BTN Very Loose: The CO should tighten its range because the BTN may frequently 3bet or call, putting the CO out of position postflop. Prioritize hands with strong backdoor draws or high card strength.
• BTN Very Tight: The CO can be more aggressive in stealing, even raising with a very wide range, as the BTN folds often.

3. Stack Depth

• Deep Stacked (>150 BB): The CO can play more speculative hands (small pairs, suited connectors) because of better implied odds.
• Short Stack (<40 BB): The CO should mainly play strong hands, reduce marginal hands, and avoid being all-in by the blinds.

4. Limpers in Front

• If there are one or more limpers in front, the CO should increase the raise size (typically 3 BB + 1 BB per limper) and narrow the range, playing only strong hands and hands that can isolate. Avoid playing marginal hands in multi-way pots.

Exploitative Adjustment Examples

Example 1: Blinds Fold Too Much

• Situation: SB fold rate 70%, BB fold rate 60%.
• Adjustment: The CO can raise with 44% of hands, including all pairs, all Ax, all suited cards, K9o+, Q9o+, J9o+, T8o+.
• Reason: Even weak hands are profitable because the blinds fold often.

Example 2: Blinds 3bet Frequently

• Situation: BB 3bet frequency 12% and aggressive postflop.
• Adjustment: Tighten CO range to 15%, play only pairs 77+, AJ+, ATs+, KQ+, and add some 4bet counters (e.g., AK, QQ+).

Common Mistakes

1. Fixed CO Range: Many players use the same range in the CO long-term, but it should be adjusted based on opponent dynamics.
2. Ignoring BTN Influence: The BTN's tightness/looseness directly affects CO profitability. If the CO tries to steal aggressively against a loose BTN, it easily falls into a disadvantage.
3. Uniform Raise Size: Typically the CO raises 2.5-3 BB, but can increase against limpers or weak blinds.

Summary

The CO position is one of the key positions for increasing profitability. A reasonable opening range should be based on GTO and then adjusted exploitatively according to opponent characteristics. Remember: The CO's core advantage lies in stealing blinds using position advantage. Therefore, loosen your range when the blinds fold often, and tighten it when the blinds or BTN fight back strongly. Mastering these principles will significantly improve your CO play.