Poker Term
小盲位15大盲注防守（SB 15bb Defense）
SB 15bb Defense
In Texas Hold'em, it refers to the defensive strategy and range adopted by the small blind player when facing an opponent's raise with an effective stack of 15 big blinds.
Conceptual Background
SB 15bb Defense occurs in tournaments or deep-stack cash games during short-stack phases, when the small blind (SB) has an effective stack depth of about 15 big blinds (bb). Players need to develop a specific defense range against raises from various positions. At this stack depth, the stack is short but not yet in the extreme shove/fold range, so the strategy lies between all-in and call.
Key Factors
- Positional disadvantage: The small blind is out of position, making it difficult to leverage skill post-flop, so the defense range is typically tighter.
- Pot odds: The small blind has already invested 0.5bb. Facing a standard raise (e.g., 2bb or 2.5bb), they need to call 1.5bb or 2bb, giving pot odds of about 25%-30%, which allows many marginal hands to call.
- Resteal threat: The small blind must guard against the big blind (BB) squeezing or re-stealing, so the defense range needs to balance value and bluffs.
Typical Defense Range
Example (assuming opponent raises to 2.5bb):
- Value range: TT+, AQ+ (sometimes shove to generate fold equity).
- Calling range: A5s-A9s, KQo, 22-99, suited connectors like 87s+.
- Defense frequency: Approximately 25%-35% of starting hands, depending on opponent tendencies.
Strategy Adjustments
- Tighter range if the opponent raises larger; wider if they raise smaller.
- Increase shove frequency against aggressive opponents to counter steals.
- When short-stacked, avoid calling with easily dominated hands; prioritize hands with post-flop playability.