A deal from an EBU online Duplicate.
Dealer E E-W vulnerable.
East pre-empted with three hearts, South overcalled four diamonds and North made an agricultural slam try.
West led the two of hearts, how do you play?
Drawing trumps will work if they break two-two but you will run out of tricks if you try that and they break three-one.
However dummy's trumps are good enough to try ruffing two spades in dummy. So play spade to the ace and king of spades and trump a spade in dummy with the ten of diamonds. Now the heart ace to discard a club. West will trump this and return a club which you win with the ace, then ruff a club back to hand, ruff another spade on table with the jack, and then draw the outstanding trumps.
The full deal was