bingo

At the table, I would lead the ace of clubs, but would not be surprised based on the question in this forum, the comment by meckstroth, and the double by partner, if a heart lead is best. without the heart lead a cross-ruff may be in the offing.

It is hard to answer without knowing if we were in a forcing pass situation. The vul. suggests maybe not. But i am not clear. It is not without some trepidation, but I would play the ♣ Ace. I think a spade is the only other option - Partner cannot be asking for a heart lead. Unless, of course, this is merely a "i think we can beat this pard" double. Then any lead might work and none might be wrong.

An alternative to the single 10 of diamonds on the right is to play RHO for honor 10 in diamonds. You would then plan on leading low toward your hand from dummy. If RHO plays the ten, you play the jack and crash the honor on the ace on the second round of diamonds. If RHO plays the honor, you play low, and then run the jack (smothering the 10) when in with the heart ace. So, get to dummy with the club queen and play a low diamond. (Of course, all the time you are presuming they cannot run a bunch of spades.)

After thinking some more about it, I think it is cold regardless of whether west has singleton or doubleton king of hearts. At trick 5 play a heart to the Ace, if west shows up with the singleton king, then play a heart to the queen - it does west no good to ruff, then heart to the jack, again west cannot ruff or the endplay is still on and you now have a second ruff in dummy. Now you can play on high cross-ruff lines, being sure to ruff a club first, then a spade, then last club etc... losing last heart trick. If the heart does not drop under the ace after trick 5, cash a third diamond and then lead a low heart. Now west is endplayed as before. Maybe i missed something.

It seems to me you have to play east for either singleton or doubleton K of hearts and play to throw east in for an endplay - to eliminate the need for 2 ruffs (lose 1 trick now, gain 2 tricks later). Based on the bidding, it seems that east has a singleton. So, play the last diamond to hand and play a low heart toward the queen (not that it matters which hand you play the heart from). East now must lead away from either the Ace of spades or the 10 of clubs (which based on the bidding and play she surely has). This sets up either the K of spades or your 9 of clubs. My thoughts anyway. --Matt