Against 3NT, East won the diamond lead (? Don't ask why a heart wasn't started) and returned a diamond. It's obvious that finessing yields a twelfth trick here, but at the table declarer played the king, thus creating a loser for herself. Was this a bad play? No, because on the run of the clubs East got squeezed in spades and diamonds:
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West led a spade to South's 8. At trick 2 declarer led a diamond to the queen, which East for some reason allowed to win. Ace and another diamond put East on lead (West pitching a spade):
East now played the club queen, jack and another club, semi-endplaying West while simultaneously establishing dummy's long club. (This was not exactly a high-caliber game.) West, knowing a spade return would let declarer claim, tried a tricky 2. Declarer had marked West with the K for his overcall, but played the ace!
Declarer now cashed the 8 pitching his J. He then cashed the 8 (tossing his heart) to squeeze West in the majors. Showoff!
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