West switched to a club when the jack of spades was ducked all around. South scooped the jack, cashed the ace and crossed to the ace of diamonds to play off the club king. East ruffed with the eight of hearts as declarer discarded a spade. East returned a diamond for the jack and queen but the exit of a club was trumped by East with the king of hearts. South could not score more than his five top tricks and the partscore was down two, N-S 200.
West accepted the insufficient bid by passing at once, conveying his desire to defend a heart contract and denying a good hand. Therefore, one heart became the final contract when all passed.
If West had not accepted the one heart overcall, then South would have have been compelled to make it sufficient by correcting to two hearts or make any other legal call except double. In the latter case, North would be barred for the entire auction. North should have been aware of what was going on when West accepted the insufficient call. He should make haste to advance to 1NT, a partscore that would be far superior to hearts. Even if South rebids two diamonds in this scenario, this would land the partnership in a playable contract.
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