The big blind gets great pot odds but is always OOP. Learn how to adjust your defense range and 3-bet strategy based on the opener's position.
The BB is the most distinctive seat at the preflop table:
These two factors pull in opposite directions, making BB defense one of the most nuanced decisions in poker.
If BTN opens to 2.5bb, what are BB's pot odds?
Pot: SB 0.5bb + BB 1bb + BTN 2.5bb = 4bb
Call cost: 1.5bb (already invested 1bb)
Pot odds: 1.5 / (4 + 1.5) = 27%
You only need 27% equity to call (very wide defense)
The opener's position changes their range strength, and BB's defense must adjust accordingly.
| Opener Position | Opener's Range | BB Calling Range | BB 3-Bet Range |
|---|---|---|---|
| UTG (≈15%) | Very strong | Narrow (≈20%) | Narrowest |
| HJ (≈20%) | Strong | Medium (≈25%) | Narrow |
| CO (≈28%) | Average | Wide (≈33%) | Medium |
| BTN (≈45%) | Wide | Very wide (≈40%) | Wide |
| SB (≈40%) | Wide | Widest (≈45%) | Very wide |
| Factor | Cash Game | Tournament |
|---|---|---|
| BB defense range | Wide | Narrow (ICM pressure) |
| 3-bet frequency | High | Situational (decreases near bubble) |
| Set mining | Aggressive (100bb deep) | Stack-depth dependent |
| Suited connectors | Actively call | Fold below 20bb stacks |
BB Defense Checklist
Source: Upswing Poker
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