There is an expression “Long In Trump Lead Length” and there is no reason not to conform with that here. As you have 4 trumps and a decent Spade suit you should make a positive ªK lead.

Declarer will be pinned to dummy and whatever he plays next, either you or partner will get the lead and play a trump.

Now the defence will get to make 2 Spades   1 Diamond and 2 clubs defeating the contract by two tricks.

Had you made a short suit lead, possibly clubs and partner continued clubs then declarer will have the timing to prevail and easiy make 10 tricks by way of 1 Spade, 7 trumps and 3 established clubs

(Declarer will chuck his losing Diamond away if East tries to play a third round of Clubs, but he might play a high Diamond first. If he does that then declarer could ruff the third club very high and have the timing to go over to the ©J back to hand via a Diamond ruff to draw the rest of the trumps and still the ªAce is there as the entry back to the established 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