This deal is from the Tollemache qualifying competition earlier this month.
When opponents reached four hearts after a simple auction South felt that he had a solid double.
South led the club king, declarer won and then took a club discard on the diamonds and played a heart and was quickly one off.
However, if declarer had considered that South was likely to hold all the missing trumps for the double he could have made the contract.
After the diamonds he should ruff a club to shorten his trumps, then play a spade. South wins and returns a Spade, declarer then ruffs another club.
This is the position now, East leads a low heart, South can get off play with a spade ruffed by East, who now ducks another heart to endplay South in trumps.
Well done to the two declarers who made four hearts doubled.
Slight variations in the order of play are possible.