A deal from the Middlesex Congress Swiss Pairs earlier this month.
If West plays in four hearts, the contract can be defeated. How?
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North leads the spade king won by East. A heart is played from table, covered by South, West and won by North who cashes a spade and leads another spade ruffed by East. East now plays another heart covered by South and West and won by North again who plays another spade. South ruffs this with the four and West overruffs with the king. North's three of hearts now beats West's two of hearts for the setting trick.
If the three and two of hearts are swapped then four hearts cannot be beaten.