Five-card stud. Table stakes. Last betting interval.
Player A has Q, J, 10, K showing, plus hole card.
Player B has 6, 10, 8, 4 showing, plus hole card.
Player A has taken the lead throughout; Player B has played along, outlasting other players. Player B has a six in the whole, giving him a pair of sixes.
On the last card, Player A bets out, perhaps half his stack.
Player B knows that there are six cards that would give Player A a cinch hand: A, K, Q, J, 10, or 9. But Player B taps.
Player A calls and loses. His hole card is a seven.
There was nothing unusual in the fact that Player B figured
the bluff of Player A. Every sucker in the land does that several times per session. The significance of this case is in the fact that Player B tapped and that Player A called.