Again?

A Q 10
Q 6 3 2
A J 9 6 4
J
8 6 5 3 J 9 4 2
J 9 5 10
10 7 2 K Q 3
Q 8 7 A 10 6 4 3
K 7
A K 8 7 4
8 5 Contract: 6 hearts
K 9 5 2 Opening lead: 5 of hearts

The day after I picked up this hand, a heart grand with a 3-1 trump split dependent on getting two ruffs in dummy, I came across this one above with some similarities. Only 4 people bid the fairly easy-to-make slam and only one of those made it! Which is a little strange on both counts when I think of how many totally unmakable slam bids I come across.
In any event, there was something I wanted to say on that heart grand but let go because the discussion got too long and will say here. Within limits, you should be thankful that hands offer a bit of a problem. Of course if you're way overbid, it won't be easy to be philosophical about the merits of getting into difficulty. But I did say "within limits," and there are two reasons why you should be thankful. The first is that these difficulties are the very essence of the game. You don't want a game where you merely tot up your points, make your bid and when dummy comes down claim X number of tricks. And the second reason is that it's these difficulties that you can anticipate and surmount that allow you a chance to pull ahead of the field, no?
Each of these hands would have been a virtual laydown on a 2-2 trump split. But you should be happy with the 3-1 trump split, since the contracts are still makable and this allows you to pull ahead of the duffers who aren't very careful, as that one declarer did.
When I looked at the hand, my immediate reaction was that it should make. The ace of clubs is favorably placed, so you only need to ruff two clubs. A low diamond will go on the spade differential and given the definite possibility of a 3-1 trump break, the queen must not be used for ruffing. Please note, as with the hand referred to above, you must take care of every card in the closed hand, with a tolerance for one loser -- or every card in dummy, if you chance a dummy reversal, with the same proviso. We note that spades are solid, that you can pitch a diamond on the differential, and so we only have to take care of four clubs, being able to lose one.
You take the opening lead in dummy with the Q (which you didn't expect to use for ruffing purposes, anyway) and lead toward your king of clubs and the ace shoots up. (It won't matter if East ducks. You get your two ruffs and lose a club later.) Now the king is top dog and you need only ruff two clubs in dummy, and barring some unlikely distribution, you're in clover. East shoots perhaps a spade back (as one did). You win with the K, ruff a club, back with a trump to the A, and ruff your last club. Obviously if trump were 2-2, we'd be perfectly safe now. Still, we'll play the hand we've been dealt. At that point, cash the top spades, sluffing a diamond, ace of diamonds, ruff a diamond, draw the last trump and claim. Your king of clubs is good. Do not cash it before ruffing clubs, as some declarers have been known to do. Do not cash it as long as you have access to it.
A little curiously, the three who went down found 3 different ways of doing so. The first one I looked at led three rounds of trump, not immediately, but before looking to ruff two clubs. No can do. You've only one trump left in dummy with two clubs looking to be ruffed.
A second declarer let the heart opening lead ride to his ace. Since you want to lead toward your king of clubs, you'd do well to go up with the queen of hearts and lead a club at trick two. Still, that wasn't fatal. This declarer now went to his Q of hearts and led a low club. Had the third trump lain with East, of course, that defender could have led a third round of trump. But being unable to do that, he led the K of diamonds. Declarer could still have ruffed out the clubs, thus: come to the K of spades, ruff a club, cash top spades, sluffing a diamond, ruff a diamond, ruff a club, ruff a diamond, draw the last trump and claim.
Unfortunately, seeing himself wide open for a diamond loser, this declarer didn't use that K of spades entry for ruffing a club, but rather ran three spade tricks to sluff a diamond. Then he ruffed a diamond, ruffed a club, ruffed a diamond, ruffed a club and . . . He now had the high trump and a good K of clubs in the closed hand, but he's in the wrong hand and has no way of drawing West's last trump. Nor would it have helped declarer to cash his king of clubs before embarking on that crossruff, as another declarer did, for West could throw a diamond on the fourth round of clubs and declarer wouldn't have the re-entries to the closed hand he needed.
And third declarer? Well, that hand was butchered from the beginning. Spade lead, prompting declarer to a third round of the suit, sluffing a diamond, then the ace of diamonds! You don't wanna cash that ace of diamonds now, do you? You've always got an entry to it, and it only allows the defense to pump you in diamonds. But it gets stranger. A club to East's ace, a diamond, ruffed, the king of clubs ruffed, a diamond ruffed . . . wait a minute! Back up. The king of clubs ruffed? Why on earth is this winner ruffed, and not only ruffed, but on the second round of the suit, when the ruff of a low club would have been just as effective in transferring the lead?
Totally unclear and I don't think I need go further. I haven't looked up this player's self-ranking, but if it's above neophyte, he's flattering himself.

The heart grand slam referred to above also had 7 diamonds, but there the split was 6-0 in the opponents' hands. Here the split is a benign 3-3, and a dummy reversal would have worked. Which is to suggest that with the ace of clubs offsides, you might still have a chance, though it might depend on the leads up to that point. I can't go over every permutation. But here with the hand we have on, say a spade lead, take three rounds of spades, sluffing a diamond, ace of diamonds, ruff a diamond, queen of hearts, ruff a diamond, cash the ace king of hearts -- that's all the trump you've got in the closed hand, but you still have one in dummy -- and just throw out a club. Dummy is now high.
Obviously banking on a 3-3 diamond split isn't all that appealing. Just thought I'd mention the potential, however.