Vladimir Kramnik, who became the world chess champion in 2000 when he defeated Garry Kasparov, said about that match, "At some point he (Kasparov) seemed to lose all confidence trying to break down the Berlin Wall." Kramnik won two games and drew the other 13, using the Berlin Defense of the Ruy Lopez to great effect.
In this deal, South is in six spades. West leads the heart king and continues with a second heart. After ruffing, how should declarer proceed?
When North raised to two spades, South wondered if North had the right cards for a slam. North assumed South's three-diamond rebid was a help-suit game-try, looking for values in diamonds. With that king and four spades, he jumped to game. Now South took a shot at six spades. (Roman Key Card Blackwood would have worked well, allowing South to find out that the spade king and heart ace were missing.)
Declarer has to play the trump suit without loss. This requires finding West with the singleton jack. So South should play a diamond to dummy and call for the spade queen.
This works when West does have that singleton, and also when East has king-low and fails to cover the queen with his king.
Note that cashing the ace can never work. Even if it drops the king, the other defender must collect a trick in the suit.
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