Two Denominations

A Q J 10 9 7
7 3 2
8
A J 10
K 8 4 3 2 6 5
A 6 J 10 5 4
J 10 7 3 2 Q 9 5 4
7 K 4 3
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K Q 9 8
A K 6 Contract: 5 clubs
Q 9 8 6 5 2 Opening Lead: J of diamonds

This is a rather interesting hand in that it was played -- and misplayed -- in two denominations, each of which should've made, I would say. Above is the layout facing declarers in 5 clubs. With an opening diamond lead. Declarers were fiddle-faddling around with clubs, when it seems to me that since there are losers in the closed hand, dummy's trump holding is only three cards long and the K of clubs, which might be offsides anyway, can be offered up, along with the A of hearts as declarer develops his 11 winners.
On that lead, declarer, I believe should get an immediate ruff of a diamond, cash the A of spades, sluffing the 8 of hearts, and lead a heart toward the K Q 9.
That looks to me to be a good start taking care of the closed hand's losers. The wrong hand wins the heart lead at which point, I would say the most effective defense would be a trump lead. But declarer could handle that: go up with the A, heart to the Q, cash the second diamond honor, sluffing a heart, ruff a heart with the J. That's nine leads: one spade, one club, three diamonds and four hearts. The hand would then look like this:

Q J 10 9
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K 8 ------
------ J
J 10 Q
------ K 4
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Q 9 8 6

Wherein it should be evident that declarer should or rather could have no trouble knocking out the K of clubs and taking the rest. He couldn't lose more than one trick at this point if he tried.
Declarer should simply look losers in the closed hand and move toward taking care of them immediately. He must note a low diamond that he can ruff. He must note two low hearts, one of which can go on the A of spades, the other of which can be ruffed if declarer doesn't squander his trump.
And what did declarers do?
Case 1: Declarer took the opening diamond lead with the K and immediately led a trump to the A, spurning a finesse. Whoa! What's he going to do with the low diamond? With the 9 & 8 of hearts? Actually, he could still have recovered at that point if he'd led a heart, getting the luck that the defender with the A of hearts has no trump he could lead. Declarer could then have captured any lead, and as given above, sluff a heart on the K of diamonds, ruff a diamond, cash the A of spades, sluffing a heart, come back with a heart to the Q and ruff a heart with dummy's last trump.
Instead, declarer followed his club lead to the A with the J of clubs, East ducking, perhaps outta fear that his partner now has a stiff Q, but in any event, it was one trump lead too many, and now declarer has three spot cards to take care of, along with unavoidable tricks lost to the A of hearts and K of clubs. Declarer was indeed able to take care of two of those spot cards, one on ruffing a diamond, one on sluffing a heart on the A of spades, but that was his margin of defeat: down one. And down two if East hops up on the second club lead and shoots a club back.
Case 2: Declarer also got a diamond opening lead and immediately went to a trump lead to the 10 . . . holding! I don't know why these East's wanna play coy with that K! This declarer also could've recovered through the favor of East by leading a heart to West who was now without trump. And as given above, declarer could've taken care of his three spot cards through ruffing two and throwing one on the A of spades. But if the East defenders were a little lax in their defense, these two declarers were far more culpable of indifference to winning plays.
This one, after the 10 of clubs held, cashed the A of spades, throwing a heart and took a ruffing finesse against the K of spades, losing of course. West cashed the A of hearts, getting the Q (for declarer had played a second heart spot on the ruffing finesse), followed by a heart to the K. Declarer at this point had lost two tricks with the K of trump still to come. And of course he had no way of picking up the K of trump.
Was it unwise for declarer to try the ruffing finesse in spades instead of concentrating on taking care of the closed hand's losers? I would say so. Oh, it might've worked and it's hard to detach oneside from the suspicion of hindsight. But I have said elsewhere that much as I encourage the taking of natural finesses, I'll do anything to sidestep a finesse. It looks to me as though declarer has much more control of the hand ruffing out two of declarer's red spot cards, throwing another on the A of spades, than in a finesse where he's so helpless. He's got every trump, excepting the K, down to the 8, so those ruffs are going to be pretty safe. But it you like the idea, be my guest.
This hand was doubly interesting to me, because other declarers were playing in 4 spades -- and likewise mishandling their potential. I have give the spade declarers here.