A bluff-catcher is a hand that beats your opponent's bluffs but loses to their value — typically a medium pair on the river. Whether to call is pure math + reads.
The key question: how many bluffs do they have?
To call profitably, your opponent's bluffing frequency must be higher than the pot odds they're giving you. If they bet 1/2 pot, you need them to bluff ~33% of the time; if they overbet, you need many more bluffs — and almost nobody overbets as a bluff.
The size gives you away
- Small/medium bet → wider range, more bluffs: your bluff-catcher calls.
- Huge bet / overbet → polarized range loaded with value: with just a pair, fold.
- Blockers: if your card blocks their value hands (e.g. you hold an Ace on a spade flush board and they represent the flush), lean toward calling.
⚠️ Error común: Calling every river “out of curiosity” is one of the most expensive leaks. A pair is no reason to call any size.
💡 Clave: Bluff-catcher: call small/medium bets, fold the huge ones. Count their bluffs, not your hand.