West elected to start with the singleton diamond as declarer topped the jack with the ace. East took the queen of spades with the ace to fire back a suit preference deuce of diamonds. Partner ruffed to return a club as East scored the ace to deliver a second diamond ruff and the game was down one, N-S -50.
West disregarded partner's double of the club cue bid to choose instead the singleton diamond which proved to be the killing lead. East could be certain that partner had led a singleton since he had asked for a club lead.
South will have an easy time when West selects a club. He wins the second club, draws trump and plays a diamond to the king followed by another playing the ten when East declines to split his honors.
South will lose a club, a diamond and the ace of spades for a satisfying +420. North might have advanced with two hearts but the major suit game would still be reached when South rebids diamonds and raises spades. North judged it more important to disclose a three- card limit raise of spades via a club cue bid. He would have revealed four-card support with a Bergen Raise.