Cutoff CO Opening Range Guide: Standard Strategy and Adjustment Tips

[Cutoff] Strategic Value of the Cutoff

The cutoff, the position to the right of the button (often CO in 6-max), has the best preflop action advantage after the button. Since only the button and blinds act after the CO, and the button hasn't acted yet, the CO's opening range can be wider than early position, but still needs to account for button squeezes and blind defenses.

Mastering the correct cutoff opening range is fundamental to profitable poker. This article provides standard ranges and adjustments based on [GTO] and common exploitative strategies.

Standard Cutoff Opening Range (6-max, 100BB Effective Stacks)

Open Raise Range

• Strong Hands (Value Raises): [AA], [KK], [QQ], [AKs], [AKo], [AQs], [AQo], [AJs], [ATs], [KQs], [KQo], [KJs], [KTs], [QJs], [QTs], [JTs], [T9s], [99]+ (pairs from 99 up)
  • Explanation: These hands usually have strong playability or direct value postflop.
• Medium Hands (Mixed Raises): [A9s]-[A2s], [K9s], [Q9s], [J9s], [T8s], [98s], [87s], [76s], [65s], [54s], [44]-[22] (small pairs)
  • These hands are used partly for protection, partly for bluffs or draws.
• Bluff Raises: Some suited connectors like [64s], [53s], and some Axs (suited aces) can be mixed in.

Typical Range (about 22-25% of hands):

• Pairs: 22+ (all pairs)
• Suited Aces: [A2s]+ (all suited aces)
• Offsuit Aces: [A9o]+ (AJ+ is usually stronger, but can widen to [A9o])
• Suited Connectors: [54s]+ (some include [43s], [32s])
• Offsuit Connectors: [T9o]+ (but many players fold offsuit connectors below [QJo])
• Suited Gappers: [J9s], [T8s], [97s], [86s], etc.

Limping Range

In most standard strategies, limping from the cutoff is not recommended because it gives the blinds a cheap look at the flop and makes it hard to protect weaker hands. However, against weak passive opponents, you can occasionally limp with medium-strong hands to induce raises (traps).

Exceptions:

• When the blinds are very aggressive and [3-bet] frequently, limping AA/KK can disguise strength.
• When there are multiple limpers, the CO can limp with marginal hands (e.g., small pairs, suited connectors) to see a flop.

All-in Range (for short stacks or [4-bet] after a [3-bet])

• Effective stacks under 20BB: All-in with any pair, any ace, any king, suited connectors.
• As a [4-bet] all-in (facing a 3-bet): Usually value all-in with QQ+, AK, and mix some [A5s], [A4s] as bluff all-ins (to balance range).

Adjustments Against Different Opponent Types

Tight-Passive (TAG or Nit)

• Widen raising range: Add more marginal suited connectors and small pairs, since these players rarely 3-bet and you can see flops cheaply.
• Reduce bluffing: If they have a high fold-to-cbet rate, reduce postflop bluffs.

Loose-Aggressive (LAG)

• Tighten raising range: Reduce easily exploitable hands like suited connectors, as opponents may 3-bet frequently.
• Increase [4-bet bluffs]: Use hands like [A5s] to 4-bet bluff, forcing folds.

Aggressive Blinds

• Reduce raising frequency: Avoid raising weak hands to prevent getting 3-bet into tough spots.
• Increase limp-traps: Limp AA/KK, or add more medium hands to your limping range.

Passive Blinds

• Raise heavily: Almost any two cards can be raised if you have a postflop skill advantage.

Common Mistakes and How to Avoid Them

1. Range too wide: Raising over 30% of hands from CO in 6-max can lead to frequent 3-bets from blinds, costing chips. Keep it around 22-25%.
2. Lack of position awareness: The CO is still constrained by the button. Don't use too many marginal hands to raise, especially against sharks.
3. Ignoring stack depth: Adjust range when short-stacked. Use more all-ins or push/fold, reducing fancy plays.

Practical Examples (Typical Scenarios)

Example 1: 100BB effective, 6-max, CO holds K♠T♠, folds to you. You raise to 3BB, button calls, small blind folds, big blind calls. Flop J♠7♠2♣. You have a flush draw and a gutshot straight draw, so you can continue with a half-pot bet.

Example 2: 25BB effective, folds to CO holding A♣3♦. According to short-stack strategy, you can shove all-in directly, as [A3o] has enough equity heads-up.

Summary

CO range should balance value and bluffs, while flexibly adjusting based on opponent types. The standard range is approximately 22-25% of hands, including pairs, suited Aces, some suited connectors, and strong high cards. Avoid limping; use raises to apply pressure. With a short stack, switch to a shove strategy. Remember the positional advantage: use position postflop to easily gather information.

Keep in mind: there is no fixed range. Understanding opponents and dynamically adjusting is the key to long-term profitability.