Cash Game Preflop Strategy: Adjustments When Stack Depth Exceeds 100BB

Deep-Stacked Cash Game Preflop Strategy Overview

In cash games where effective stack depth exceeds 100BB, preflop strategy requires significant adjustments. Deep stacks mean higher potential pot odds, implied odds are more favorable for draws and backdoor draws, and postflop play offers more maneuverability. Therefore, the sizing and ranges for preflop raises, 3-bets, and 4-bets differ from traditional 100BB stack depth.

Preflop Raise Size Adjustments

In deep-stacked situations, the standard open raise size is typically between 3BB and 4BB. Too small a raise (e.g., 2BB) offers overly favorable pot odds, attracting too many callers and making it difficult to generate postflop advantages. Too large a raise (e.g., over 5BB) may scare off weak hands but also increases your own risk.

• Early position (UTG, MP): Recommended raise to 3.5-4BB to limit opponents' calling ranges.
• Middle-to-late position (CO, BTN): Can slightly reduce to 3-3.5BB, leveraging positional advantage.
• Blinds (SB, BB): Against steal raises, the re-raise size is typically 4-5BB.

3-Bet and 4-Bet Strategy

Deep-stacked, 3-bet and 4-bet ranges need to be more cautious. Since large postflop bets are possible, the value range for 3-bets should focus more on big pairs and strong A-high hands (e.g., AA, KK, AKs), while reducing 3-bet bluffs with medium suited connectors.

• 3-bet sizing: 3.5-4x opponent's raise is recommended, adjustable by position. For example, when BTN 3-bets a UTG raise of 3BB, the size could be 12-14BB.
• 4-bet sizing: 4-bets are typically 2.2-2.5x the 3-bet amount, roughly 25-30BB. Avoid overly large 4-bets that let opponents fold easily, sacrificing extra value.
• 5-bet shove range: Only AA, KK, and rarely AKs as a mix. In deep stacks, shoving QQ is high risk as opponents may hold KK+.

Positional Factors and Range Tightening

In deep-stacked environments, positional advantage becomes more pronounced. Early and middle position players should open tighter, avoiding medium hands like T9s or QTo because postflop they may face large bluffs or value extraction.

• Early position (UTG): Recommended to raise only about 12% of hands (e.g., all pairs + AK, AQ, KQs, AJs, etc.).
• Middle position (MP): Can be slightly looser, raising about 15%, but avoid low suited connectors.
• Late position (CO, BTN): Can raise with roughly 20-25% of hands, but still need caution against tight early position ranges.

Avoiding Marginal Hand Traps

Deep-stacked, marginal hands (e.g., KJo, QTo, small pairs) have appealing implied odds, but postflop they can easily become passive. For instance, calling a large 3-bet with a small pair to hit a set, but if you miss and the pot is big, it's hard to continue. Recommendations:

• Small pairs (22-88): Only consider calling a 3-bet when in position and the cost is less than 5% of effective stacks.
• Suited connectors (e.g., 87s): Can mix in calls moderately in deep stacks, but avoid frequent 3-bet bluffs.
• High cards (AJ, AQ): Don't slowplay in early position; raise or 3-bet to avoid getting outdrawn postflop.

Practical Example

Suppose you are on the BTN with 250BB effective stacks, and the CO opens to 3BB. You hold AA. A standard 3-bet to 9-12BB might be too small; consider raising to 14-16BB to force opponents to call with weaker ranges, giving you position and nut advantage postflop. If opponent 4-bets to 35BB, you can 5-bet shove or raise to around 70BB, leaving room for postflop play.

Summary

The core of deep-stacked cash game preflop strategy is: increase raise sizes, tighten ranges, handle 3-bets/4-bets carefully, and fully utilize position. Avoid getting involved in deep-stacked pots with marginal hands, and keep postflop decisions manageable.