Big Blind vs Button 3-Bet Defense: When to Call or 4-Bet

Short Answer
BB versus BTN 3-bet defense should split into calls and 4-bets. Calls need playability and price. 4-bets need premium value or blocker-heavy bluff candidates.
Why It Is Hard
BTN ranges can be wide, but BB usually plays out of position postflop. You may get a price, yet your realization is lower. Marginal hands should not continue only because they are ahead of part of BTN's range.
Range Structure
Premium pairs and strong Ax become value 4-bets. Axs and Kxs with blockers can be selective 4-bet bluffs. Medium pairs, suited broadways, and playable suited connectors often prefer calling.
Decision Steps
- Confirm BTN's 3-bet range is actually wide.
- Calculate price, then discount OOP realization.
- Use blockers for 4-bet bluffs, not random weak hands.
- When called, plan postflop around lower SPR.