Cutoff Opening Range Guide: From Basics to Advanced Strategies

Why Is the Cutoff So Important?

The cutoff (CO, the seat to the right of the button) is one of the last unentered positions to act preflop. Compared to early and middle positions, the CO can observe opponents' actions more clearly while also using the button's call or raise to absorb extra information. Therefore, the CO opening range is typically wider than early positions but narrower than the button, making it a key position for balancing aggression and defense.

Basic Opening Range Example

The following range applies to a standard 9-handed table against average opponents (no specific adjustments). Assume 100BB effective stacks, no ante.

Raising Range (approximately 20-25% of hands)

• Strong hands (value raises):

  • All pairs: 22+ (about 6.8% of hands)
  • All Ax suited (A2s+, about 3%), AJo+ (offsuit, about 3%), ATo+ (about 2%)
  • All suited connectors (54s+, about 2.7%), offsuit connectors (T9o+, about 1%)
  • Some suited gappers (J8s, T7s, etc., about 1%)

• Semi-bluffs and mixing:

  • Small suited connectors (54s+) and suited gappers (K9s, Q9s, etc.)
  • Offsuit connectors (T9o+)
  • Low suited aces (A2s-A5s) for postflop draws

• Example range (narrow):

  • Raise: 22+, A2s+, K9s+, Q9s+, J9s+, T8s+, 97s+, 86s+, 76s, 65s, ATo+, KTo+, QTo+, JTo, T9o
  • About 22% of hands

Note: The above is only a typical instructional example. Actual ranges must be adjusted based on opponents and dynamics. Do not blindly apply.

Logic Behind the Raising Range Composition

1. Value range: Pairs (especially small to medium) are good for blind stealing from the CO because they easily flop sets or allow continuation bets. Medium-to-high broadways (AJ+, KQ) have showdown value in position.
2. Semi-bluff range: Suited connectors and suited gappers have good playability postflop. Even if the flop misses, position allows continuation bets.
3. Stealing range: Small pairs (22-66) and weak Ax (A2-A9) are mainly for stealing the blinds. When blind players fold frequently, these hands can be profitably raised.

Key Adjustment Factors

1. Opponent Types

• Nits (tight-passive): Expand raising range, increase blind stealing. Can add more marginal hands (e.g., K9o, Q8s).
• LAGs (loose-aggressive): Tighten range to avoid frequent 3-bets. Remove weak pairs and low suited connectors; keep stronger hands.
• Aggressive blind positions: If SB or BB likes to 3-bet, reduce marginal hands and use medium-strength hands (e.g., AJo, KQ) for 4-betting or calling.

2. Stack Depth

• Deep stacks (>100BB): Increase the proportion of suited connectors and structured hands (e.g., 65s, T8s) because they can build large pots postflop.
• Short stacks (<40BB): Narrow the range, mainly play big cards and pairs, reduce speculative calls. If CO raise gets shoved, call with JJ+, AK, etc.

3. Blind Tendencies

• High blind fold rate (>80%): Can almost raise any two cards, but for balance it's wise to maintain roughly 40% raise frequency to avoid exploitation.
• Active blind defense (frequent calls or 3-bets): Tighten range, raise with more linear hands (e.g., medium pairs, high cards), reduce suited connectors.

4. Table Fold History

• If the table has folded for many consecutive orbits, you may lower raise frequency slightly because blinds might fight back.
• If you often get squeezed by the button or blinds after raising in CO, consider more limps or narrowing the range.

Advanced Strategy: Cold Calling and Mixing

In the CO, besides raising, you can sometimes limp or fold. Generally, limping in the CO exposes hand strength and fails to use position advantage to eliminate players behind you.

• Mixed raise sizes: Standard raise is 3BB, but adjust based on opponents. Against weak blinds raise 2.5BB; against aggressive blinds raise 3.5BB to reduce odds.
• Responding to 3-bets: After a CO raise, if 3-bet, the calling range usually includes medium pairs (77-TT), suited high cards (AKs, AQs), and some connectors (T9s, etc.). Fold weak suited aces (A2s-A5s), small pairs, etc.

Summary

The cutoff opening range should center on flexibility and position advantage. Remember these principles:

• Base range around 20-25%, adjust based on opponents.
• Against weak blinds, increase stealing; against strong blinds, tighten and preserve showdown value.
• The deeper the stacks, the more the range can lean toward speculative hands; the shorter the stacks, the more it should focus on big cards.

Practice makes perfect. It is recommended to test the profitability of different ranges at low stakes and gradually build your own CO strategy system.