Cutoff CO Opening Range Guide: How to Properly Raise and Adjust

Position Advantage of the Cutoff (CO)

The Cutoff (CO) is the third most important position in Texas Hold'em, behind only the Button (BTN) and UTG. Its biggest advantages are:

• Positional Control: Only the Button and the blinds (SB/BB) act after you, allowing you to observe almost all opponents' actions before deciding.
• Steal Potential: The Button and Small Blind often have wide defending ranges, so a CO raise can sometimes take down the blinds immediately.
• Informational Edge: You see whether the earlier positions limped or folded, helping you assess hand strength more accurately.

Consequently, the CO's opening range should be wider than UTG’s but slightly tighter than the Button's. A baseline of about 20–25% of hands is generally recommended, adjusted according to opponents and stack depth.

Example Typical CO Opening Range

Below is a typical CO raising range (roughly 22% of hands) for unknown opponents with 100 big blinds (100bb) effective stacks:

• Strong hands (value raises): All pairs (22+), all A-high hands (A2s+, ATo+), all suited connectors (54s+), plus KQo, KJs+, QJs+, etc.
• Mixed range (suited/connected): Some offsuit broadways like KJo, QTo, JTo (can be raised or folded depending on table dynamics).
• Marginal hands (selective raises): Small suited connectors like 32s–65s, gapped suited hands like A3s–A5s, etc., occasionally raised to balance the range.

Note: This is a simplified example. The actual range should be adjusted based on earlier limpers, player tendencies, and the blinds’ aggression level.

Key Factors Influencing the Range

1. Action from Early Position

• If someone limps in early position: Raise to 2–3bb + 1bb per limper. Tighten the range and isolate the limper.
• If someone raises in early position: You should 3-bet or fold. There are few good reasons to call from the CO without a specific read.

2. Blinds’ Playing Style

• Loose-aggressive blinds: They often squeeze, so your raising range should be tighter – fold more marginal hands.
• Tight-passive blinds: They seldom 3-bet or defend, so you can raise wider and c-bet frequently.
• Calling stations: Avoid entering with suited connectors; instead, use strong hands or pairs since they rarely fold.

3. Stack Depth

• Shallow stacks (<30bb): Raise tighter, mainly all-in or min-click with strong hands.
• Deep stacks (>150bb): Can raise a bit wider and use more suited connectors to build pots or bluff later.

4. Button’s Tendency

The Button is your biggest threat. If the Button is tight, he rarely defends after your raise – you can open wider. If he is loose-aggressive and often 3-bet, you should tighten your range to avoid being in a bad spot.

Common Mistakes and Adjustments

Practical Tips

• Raise sizing: Standard 2.5–3bb. If blinds are very weak, reduce to 2bb; with limpers, raise to 3bb + 1bb per limper.
• Responding to 3-bets: 4-bet or shove with QQ+, AK; consider calling with medium hands like JJ, AQ but be cautious; fold marginal hands.
• Continuation betting: After raising from the CO, you should c-bet most flops (especially on dry boards) to exploit your position and steal the pot.

Summary

The core of the opening range from the Cutoff is to leverage position while avoiding being re-stealed by the blinds. Beginners are advised to start with a tight range (~20%) and then adjust based on opponents. Remember:

• Tighten and isolate when someone limps in early position.
• Tighten against loose-aggressive blinds; loosen up against tight-passive ones.
• The Button is the biggest threat – watch his 3-bet frequency and adjust accordingly.
• Always keep your range balanced; don't only raise strong hands or only raise speculative hands.

Execute the CO strategy correctly, and you will see a noticeable improvement in your win rate.