小盲位20BB反偷盲（SB 20bb Resteal）

Concept

SB 20bb Resteal is a common strategy in tournaments, especially when the small blind has a stack depth of around 20 big blinds. At this point, the player is out of position (acts first post-flop), but the stack is sufficient to apply effective pressure on the stealer.

Principle

When an opponent (usually in the big blind or on the button) attempts to steal with a wide range, the small blind fights back by shoving or making a large raise. A 20BB stack means:

• If the small blind shoves, the stealer must call approximately 19BB to contest the dead money in the pot (blinds + antes), resulting in unfavorable pot odds.
• If the small blind folds frequently, the stealer will tend to steal with a tighter range, thereby reducing the small blind's defensive cost.

Typical Scenario

• Blind level: 500/1000, ante 100. Small blind stack 20,000 (20BB).
• Button player raises to 2,200 (2.2BB). Small blind holds A8o, shoves for 20,000. If the button calls with KQo, equity is roughly 58% vs 42%, but the risk is high; with a weak hand like T7s, the button may fold.

Key Factors

• Opponent's stealing frequency: The looser the stealer, the more profitable the resteal.
• Pot odds: After the stealer calls, the pot is about 42.5BB (including antes). The call costs 19BB, giving odds of roughly 2.2:1, requiring about 31% equity. Therefore, the small blind's shoving range should include hands with showdown value or blockers (e.g., A, K).
• Position disadvantage: The small blind acts first post-flop, so shoving avoids complex post-flop decisions.

Notes

• Avoid overusing the resteal: If opponents realize it is frequent, they may call or 4-bet with a wide range.
• Stack size changes: Below 15BB, the resteal loses power; above 25BB, consider a smaller raise instead of shoving.