Deep Stack Cash Game Preflop Range Construction Guide: From Position to GTO

Position Scenario Description

In deep-stack cash games (typically effective stacks of 100BB or more), the importance of preflop decisions increases with stack depth. Due to higher implied odds, playable hands like suited connectors and small pairs gain value, while the dominance of big pairs decreases relatively. This tutorial is based on a 6-max cash game (6-max) and analyzes recommended ranges for each position under deep stacks.

Recommended Ranges (by Position)

The following ranges apply to typical deep-stack scenarios of 100-200BB against unknown or tight-reg opponents. The open-raise size is usually 2.5-3BB.

• UTG (Under the Gun): About 12%-15% of hands. Includes: all pairs (22+), all suited aces (Axs, Kxs, Qxs, Jxs – with A2s-A5s recommended for Axs, A6s+ can be considered), offsuit high cards (ATo+, KQo, but AQo+ is more standard), and suited connectors (T9s-T6s, 98s-87s, etc.). Excludes: small offsuit connectors (JTo and below), weak suited gappers (Q8s, etc.).
• MP (Middle Position): About 18%-22% of hands. Adds to UTG range: more suited connectors (e.g., 86s, 75s, 64s), some offsuit high cards (K9o+, Q9o+), and A2o+ (but cautiously).
• CO (Cutoff): About 25%-30% of hands. Adds to MP: almost all suited gappers (J9s-T8s, 97s, etc.), some offsuit two-gappers (K8o+, Q8o+), and small pairs (22-55) are usually opened, but adjust based on 3-bet frequency.
• BTN (Button): About 30%-40% of hands. Very wide range: all pairs, all suited aces (including A2s-A5s), almost all suited connectors (54s+), most offsuit high cards (A5o+, K7o+, Q8o+, J8o+), and even some suited gappers (42s+ may be overused). Keep balance to avoid exploitation by 3-bets.
• SB (Small Blind): About 25%-35% of hands (but limited to limp or raise). Usually avoid limping; adopt a "raise or fold" strategy. Range includes: all pairs, suited aces (A2s+), most suited connectors (T9s-54s), and some high cards (ATo+, KQo). Due to positional disadvantage, tighten range relative to BTN.
• BB (Big Blind): Defense range against raises is very wide, about 40%-60% depending on raise size. Includes: almost all pairs, all suited aces, most suited connectors, and some offsuit high cards. In deep stacks, prefer calling with suited connectors and avoid over-defending with trash offsuit hands.

Range Construction Logic

Under deep stacks, the core principle of preflop range construction is "playability first." Specific logic:

1. Implied Odds Driven: Deep stacks mean more to win postflop, so suited connectors (e.g., 87s) and small pairs (55) rise in value due to their potential to hit big hands. Conversely, AA/KK have increased postflop risk because the cost of being outdrawn is higher.
2. Position Determines Opening Range: Early positions (UTG/MP) give priority to strong hands and hands with development potential; late positions (CO/BTN) can add more speculative hands, leveraging positional advantage to realize equity.
3. Avoid Dominance Traps: Offsuit high cards like KJo are often dominated by AQo, AKo in deep stacks and are difficult to play postflop; reduce frequency moderately. Prefer suited hands to improve postflop playability.

Adjustment Factors

• Opponent Tendencies: Against aggressive players who 3-bet often, tighten early position ranges and add more bluff 3-bet hands (e.g., A5s, KQo) from late position; against passive players, widen value opening ranges.
• Stack Depth: At 100BB, ranges are more standard; at 200BB+, emphasize suited connectors and reduce raising frequency of strong high cards like AKo (consider calling or 4-betting).
• Table Dynamics: If the table frequently sees messy postflop multiway pots, add suited connectors; if preflop often goes multiway, trim marginal hands.
• Raise Size: In deep stacks, increasing preflop raise size (4-5BB) can shrink opponents' calling ranges and simplify postflop; but most regulars still use 2.5-3BB.

GTO Reference

GTO (Game Theory Optimal) strategy suggests that in deep-stack cash games, preflop ranges should maintain unexploitable balance. For example, BTN versus BB should raise with about 22%-30% of hands and call 3-bets with about 70% of its range (depending on sizing). Common tools like PioSolver recommend: at 100BB, UTG range is about 14%, BTN about 38%. Under deep stacks, a good GTO range will reduce the raising frequency of strong pairs like KK+ (partially switching to calling) and increase the raising proportion of medium suited connectors (e.g., 76s). Note: GTO is just a baseline; adjust based on opponent deviations in practice.

Practical Application

1. Establish a standard range chart: Based on personal style, select starting hands from recommended ranges and set default actions (raise/fold/call). For example, UTG can raise with QQ+, AKs, AQs, and call or raise with 88-JJ depending on late position aggression.
2. Dynamic adjustment: Observe opponents' 3-bet frequency at each table. If a player 3-bets too often, 4-bet bluff with hands like A5s or KQo; if too low, widen your calling range to attack his blinds.
3. Deep stack special strategy: With 200BB+, reduce open-raising with small pocket pairs (easily squeezed by 3-bets) and instead enter more pots with suited connectors. Against big blind defense, call with quality hands (e.g., JTs) and avoid entering with weak marginal hands (e.g., Q6s).
4. Position management: Open with a wide range in CO/BTN, but ensure you can continuation bet or fold postflop. Avoid limping with garbage from the small blind, as the cost of being out of position is high with deep stacks.

Finally, it is recommended to use a note-taking app to record your range deviations and periodically review whether your preflop decisions deviate from the core logic.