Bluff Catcher

Also known as: Bluffcatcher, Bluff-Catcher

A hand that beats only your opponent's bluffs and loses to all their value — call or fold depends purely on their bluff frequency.

Bluff Catcher

A bluff catcher is a hand that beats all of villain's bluffs but loses to all of his value bets. It can't value-bet itself, so its only job is to call and catch bluffs. Whether you call comes down to one question: does villain bluff often enough to make calling profitable?

vs pot-odds: call when villain's bluff frequency exceeds the required-equity the bet lays you. Facing a half-pot bet you need ~25% — so call if more than ~25% of his betting range is air.
MDF: to stop villain auto-profiting, defend enough combos; bluff catchers fill that quota.
Against a polarized-range (nuts-or-air), every bluff catcher is roughly equal — you're at the indifference point, and which one you pick is set by blockers.
Your own capped-range is what makes you the one doing the catching.

Pick the bluff catcher that blocks value and unblocks bluffs.

Example

River: pot is 100, villain shoves 100 into a polarized-range. You hold a marginal A♥J♣ that beats only his bluffs. The bet lays you 2:1, so you need 33% equity — call if you think more than a third of his shoving range is a bluff. Prefer the bluff catcher that blocks his value combos.