Cutoff CO Opening Raise Range Guide: From Tight-Aggressive to GTO Practical Guide

Position Scenario Explanation

The Cutoff (CO) is the seat to the right of the button. It acts after the button and blinds postflop. With only the button and blinds left to act, and the button often not entering pots lightly, the CO enjoys strong positional advantage — seeing all other players' actions postflop and controlling the pot more easily. Thus, you can open-raise wider from the CO than from early positions (UTG, MP) while still being profitable.

Recommended Range

Below is a standard TAG player's CO open-raising range, covering about 22-25% of hands (6-max; can tighten slightly in 9-max):

• All pairs: Pocket pairs 22+. Pairs can flop sets and are profitable long-term.
• All suited Ax: A2s+ (i.e., A2-A9 suited, plus AT+ suited). Suited Ax has high-card value and flush potential.
• Some offsuit Ax: ATo+ (ATo, AJo, AQo, AKo). ATo is the minimum; lower offsuit Aces are folds.
• Suited connectors/gappers: 56s+ to T9s (including 56s, 67s, 78s, 89s, T9s) and suited one-gappers like 86s, 97s, T8s, J9s, etc. These hands easily form draws in position.
• Some suited high cards: K9s+, Q9s+, J9s+ (and KTs+, QTs+, JTs+). These can compete for top pair or draws.
• A few offsuit connectors: Usually not beyond 98o, but can add 98o, T8o etc. if blinds are weak (as an adjustment).

Note: The range is not fixed; adjust for cash vs tournament, effective stack depth, etc.

Range Construction Logic

The CO range is built on these core principles:

1. Maximize positional value: In position, play more speculative hands (suited connectors, small pairs) because they can exploit positional advantage postflop via continuation bets or steals.
2. Balance value and exploitation: Strong hands (high pairs, strong Ax) extract value; medium hands (suited connectors, weak pairs) balance range and exploit opponents who call too much.
3. Avoid passivity: Rarely limp in the CO unless there's a specific reason (e.g., to induce a blind raise). Always raise or fold to maintain initiative.
4. Defend against 3-bets: The range must include enough 4-bets and calls (e.g., strong pairs, ATs+, KQs+) to prevent frequent 3-bet exploitation from the button or blinds.

Adjustment Factors

Adjust your range based on opponent dynamics in real games:

• Button 3-bets frequently: Tighten range, drop weak suited connectors (56s, 86s) and weak Ax (A2s-A5s), widen 4-bet range, and call more with strong hands.
• Blinds call a lot but play weak postflop: Widen range, add more suited connectors and weak Ax, even some offsuit connectors (98o), then use postflop advantage to extract value.
• Shallow stack depth (<40BB): Reduce speculative hands (suited connectors), increase high-card strength (ATo+, KQo), because drawing odds worsen and strong high cards are more profitable in preflop all-ins.
• Tournament final table (ICM pressure): Tighten range, especially near pay jumps, avoid weak hands clashing with short stacks.

GTO Reference

From a GTO perspective, the CO open-raising frequency should match its positional advantage. Typical GTO solver results (e.g., PioSolver at 100BB depth, no ante) show:

• Raise frequency around 22-25%, with a mix of about 5-8% limps (usually for balance).
• Range about 60% strength hands (pairs, A-high) and 40% speculative hands (suited connectors, suited high cards).
• Defense vs 3-bet: about 40% of range continues (call or 4-bet), of which about 10% are 4-bet bluffs (e.g., A2s-A5s, K9s, etc.).

Example: GTO suggests facing a button 3-bet, the CO 4-bets JJ+, AK+, AQs+; calls TT-99, AQo, ATs, KTs, etc.; and folds weak suited connectors and weak Qx.

Practical Applications

Scenario 1: Cash game (100BB), button is tight-passive, blinds loose-passive. Strategy: Widen range to ~28%, include all suited connectors (54s+), weak Ax (A2s-A5s), and K8s+. Primary goal: steal blinds and exploit postflop advantage.

Scenario 2: MTT mid-stage (50BB), button is loose-aggressive and 3-bets often. Strategy: Tighten to 18%, only open pairs 77+, ATs+, AJs+, KJs+, QJs+, AJo+, KQo+. Against button 3-bets, 4-bet JJ+, AK; call TT, AQ, ATs; fold everything else.

Scenario 3: Tournament bubble phase (20BB), blind positions extremely tight.
Strategy: Use ICM advantage to actively steal blinds, but avoid tangling with short stacks on the button. The raising range can be widened to 25%, but only call a button's all-in with strong hands (TT+, AQ+).

Summary: The core of the cutoff position is to leverage positional advantage to build a range that can both extract value preflop and apply continuous pressure postflop. By constantly observing opponents' tendencies and adjusting, you will become a formidable cutoff player.