Deep Stack Cash Game Preflop Strategy: Range Construction and Adjustment Based on Position

Position Scenario Explanation

Deep-stack cash games usually refer to effective stacks of 100BB or more, commonly 100-250BB. Preflop decisions become more complex in deep stacks because of higher postflop playability and amplified position advantage. Main positions include: UTG (under the gun), MP (middle position), CO (cutoff), BTN (button), SB (small blind), BB (big blind).

Recommended Ranges

Below are typical preflop ranges for 100BB-200BB depth (assuming no ante, standard nine-handed table).

• UTG: Opening range about 12%-15%. Hand types: all pairs (22+), all suited connectors (54s+, T9s and lower depending on situation), all AXs (A2s+), AJo+, KQo. It's advisable to avoid weak offsuit hands like QJo, KTo.
• MP: Opening range about 18%-22%. Add: suited gappers (J9s, T8s, etc.), KTs, QTs, ATo, KJo.
• CO: Opening range about 25%-30%. Add: more suited connectors (43s+), weak AXo (A5o, A4o), some K9s, Q9s.
• BTN: Opening range about 40%-45%. Includes almost all pairs, most suited hands, A2o+, K5o+, Q8o+, J9o+.
• SB: Opening range about 20%-25%. Prefer highly playable hands like pairs, suited connectors, AXs; avoid weak offsuit hands.
• BB: Against SB open, defending range about 45%-55%; against other positions, defend tighter based on pot odds.

Calling range: Generally, facing an open, the calling range should consist of the weaker part of the opening range plus some speculative hands. For example, UTG calling a BTN open with JJ-22, AQo-ATo, KQs-ATs, etc.

3-bet range: Value 3-bet: JJ+, AK, AQ (can mix in some thin value); semi-bluff 3-bet: small pairs (speculative), suited connectors (A5s, KQs, etc.). In deep stacks, 3-bet frequency should be slightly lower than in short stacks to avoid postflop disadvantage when called.

Range Construction Logic

In deep stacks, postflop potential and position are more critical. Range construction follows the "playability first" principle:

• Suited hands are preferred because of flush draw potential and high implied odds in deep stacks.
• Connectors and gappers: 54s+, J9s, etc., have straight potential and are less likely to be dominated.
• Pairs: All pairs are worth opening due to good implied odds for flopping sets.
• Big cards: AK, AQ, etc., are strong but can be dominated postflop in deep stacks; handle with care.

The later the position, the wider the range, due to information advantage and steal opportunities. UTG range is tightest, BTN is widest.

Adjustment Factors

• Opponent tendencies: Against tight-passive players, widen opening and stealing ranges; against aggressive players, tighten calling ranges and use more 4-bet.
• Stack depth: Above 200BB, avoid overcommitting with high-variance hands like AK; consider smaller pot control. As depth increases, the value of speculative hands (small to medium pairs, suited connectors) rises.
• Table dynamics: If the table is generally loose, tighten opening ranges; if tight, widen. The presence of an ante improves pot odds, so widen appropriately.
• Postflop skill: If you consider yourself strong postflop, you can widen ranges; otherwise tighten.

GTO Reference

GTO (Game Theory Optimal) strategy in deep stacks emphasizes balance. For example, on the BTN, GTO suggests an opening range of about 42% and a 3-bet range of about 14%. In practice, perfect balance is not necessary; just avoid exploitable patterns. Key numbers:

• Preflop raise sizing: Typically 3-4BB + 1BB per limper. In deep stacks, larger raises (4-5BB) can be used to reduce multiway pots.
• Defending as BB: Facing a BTN open, the BB should defend about 55% of hands (including 3-bets).

Practical Applications

1. UTG holding 66 preflop: Open, because the implied odds of flopping a set are very high in deep stacks. If 3-bet, can call or 4-bet depending on position and opponent.
2. BTN holding JTs: Open. Later, facing a BB defend, apply pressure postflop based on board texture. If 3-bet, can call or 4-bet depending on depth.
3. SB holding A2s: Standard open, avoid being too passive. If BB 3-bets, can call due to flush potential.
4. BB facing a CO open, holding K9s: Call to defend, due to flush potential, but avoid 3-betting because of weak kicker.

In deep-stack preflop, avoid overplaying marginal hands. Keep your range balanced, prioritize position and playability, and lay a solid foundation for postflop play.