Play two rounds of trump.  If West sluffs hearts, then North sluffs hearts. East has to sluff 2 diamonds.  Then lead king of clubs to Ace.  This puts the squeeze on East.  If he sluffs a heart, the dummies 7 will set up after ruffing the 3 and returning to the board with the jack of diamonds. 

 

If West sluffs diamonds , then dummie has to sluff diamond and a heart.  East has to keep his hearts.  East cannot hold both the hearts and the diamonds so again, declarer has good tricks.  Play jack of diamonds, ruff a heart and six of diamonds is good.

 

It ends up, ruff a heart , play to jack and good heart   or play jack, ruff a heart and good diamond.

WF, West slufs QC on 5S and small heart on 3S. What does North pitch on 3S?

I think Ace of clubs would work, PK.  That keeps the sluffs of West before the sluffs of North.  You still have entry to board with jack of diamonds.

nope... can't pitch AC, East can then pitch 2H and keep diam. try again

So PK, what's the solution?

WF, almost got it.

5s and 3s, pitching 9D, then KC to AC. If W saves 2d + 1h, lead 7H smothering W's 6H and trump out E's 8H. Get back to N with JD for good 3H. So West must save 1d+2h. If E saves 2h + 1d. Cash JD, trump heart with 2S for good 6D. If E saves 2d + 1h, trump 3H dropping the 8H and get back to N with JD for good 7H.