This hand comes from the EBU Brighton Congress Teams 2010. The opposition lead two top Hearts and immediately force you. You are now down to just four trumps. If you draw all the trumps now and leave no trump on the table then you will be a trick short at the end having run out of trumps in the long hand and will only be able to make 4 trumps  and five clubs. Therefore before touching trumps dislodge their Diamond Ace and then you will have no further problems and will be able to take a further force in the short hand.

With careful play you will make 4 trumps 1Diamond and 5 Clubs.

You can also view  watch the following movie to see how the hand pans out. (You need bridgvu.exe programme  or BridgeBase programme on your machine already to view it ) and it is available free from

http://www.haroldschogger.com/videos.htm