This was a genuine hand at a club not in North London, and led to a ruling. West led a low spade to South's jack and South cashed the king of clubs and finessed the jack. East won and switched to the ten of hearts to West's king and a second heart. Declarer played a diamond to the king and East won and returned a heart on which West pitched a spade. South cashed two club winners with East pitching a heart while West pitched another spade and the queen of diamonds. Declarer led a spade from dummy, but West showed his four cards before his partner had played to this trick, silently but in manner that suggested a defensive claim of an unspecified number of tricks. South, a visitor from overseas, did not think this was correct behaviour and called the director as he thought that East's defence had been made easier, and the TD ruled one trick only to the defenders, but later changed his ruling to two tricks after looking at the hand.
Two questions arise. Is this a defensive claim, even though not accompanied by a statement such as "I get two tricks"? Also, would it be worse than careless of East to discard a heart on the spade (perhaps not having noticed the queen of diamonds discard and keeping his jack guarded) and then worse than careless not to overtake the ten of diamonds despite setting up dummy's nine?
South was later criticised quite scathingly for calling the director by West!
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I agree with Lamford that West's premature claim facilitates East's defence, so the director should rule at most 1-down. When claim laws were simpler, Declarer could nominate all East's cards as penalty cards