Declarer ruffed the diamond continuation but could not avoid the loss of a heart and the contract was just home, NS +600.
North was sorely tempted to venture six clubs but feared that there would be two fast diamond losers. He knew that the partnership held thirteen clubs and, therefore, it was unlikely that partner owned much more than three top clubs. His major suit winners guaranteed success in the minor suit game. The opponents might cash two diamonds but South would be able to win the balance of the tricks.
Suppose that West doubles again and East elects to advance to five diamonds. North's double would bring the auction to a close. South would begin with a top club, a ruff and a discard! East pitches a spade from dummy, ruffs in hand and will be able to finish down one, (-200). A spade lead would secure South a ruff but a result of +500 would still be insufficient compensation for the minor suit game.
East could not consider any action over five clubs for fear that partner would assume that he held values and potentially boost to a slam.
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