BB 20bb Defense
In Texas Hold'em, the defending strategy and range when the big blind BB faces a raise with effective stacks of about 20 big blinds bb.
Basic Concepts
BB 20bb Defense refers to the defensive strategy employed by the player in the big blind (BB) when facing a raise from an opponent (typically the button or small blind) with an effective stack depth of approximately 20 big blinds. At this shallow stack depth, the post-flop SPR (stack-to-pot ratio) is low, and the strategy leans more toward all-in or fold rather than complex plays.
Defensive Range
Generally, against a raise of around 20bb, the big blind's defensive range is narrower than in deep-stacked situations, due to worse pot odds and a potentially stronger raising range from the opponent. Typically, the big blind defends with about 30%-40% of hands, including:
- Strong hands: Pairs (TT+), strong Ax (AT+), suited connectors (KQ, QJ, etc.) can be considered for 3-bet shoves or calls.
- Medium hands: Small to medium pairs (22-99), suited connectors (65s+), Ax (A2s-A9s) can be called.
- Weak hands: Offsuit connectors, garbage Ax are usually folded.
Strategic Points
- 3-bet shove: Due to shallow stacks, a 3-bet usually means an all-in, as a standard-sized 3-bet would commit a large portion of the stack. Common shove ranges include TT+, AJ+, KQ, etc.
- Calling range: After calling, the post-flop SPR is around 2-3, typically requiring a decision to go all-in or fold on the flop. Callable hands should have playability, such as small pairs hoping to hit a set.
- Folding range: Weak garbage hands (e.g., 72o, Q3o) should be folded directly to avoid unnecessary losses.
Differences from Deep-Stack Defense
- In deep stacks (100bb+), the big blind can call more speculative hands and leverage position.
- At 20bb, post-flop decision-making space is limited; hand value prioritizes made hands and strong draws. Marginal hands like Kx or Ax should be defended cautiously.
Notes
Actual ranges should be adjusted dynamically based on opponent style (loose-aggressive vs. tight-passive), position (button raise vs. small blind raise), and ICM factors (differences between tournaments and cash games). The above is only general guidance.