Surprise

A K Q 3
8 5
K J 2
A 9 7 4
J 8 7 4 2 10 9 5
K 6 4 3 2 Q J 9
8 10 9
J 5 K Q 8 6 2
6
A 7 3
A Q 7 6 5 4 3 Contract 6 no, 6 diamonds, 7 no
10 3Opening lead: J of clubs

A tough hand to defend against. Indeed, as the category suggests, there would seem to be no way of defending against 13 tricks (a few bidding the grand, more in little slam, but of course looking for an overtrick). And of course, some did not make 13 tricks. So I thought I'd look at why: A carelessness on the part of one side? Or on the contrary, was it a very clever line?
I saw at a glance that it wouldn't be easy for the defense to sort out who was guarding which suits (nor for that matter, for any but a rather adept declarer to take advantage of their difficulty). But before getting to the double squeeze, I'd like to point to two defenders who didn't even give declarer any grief. One (when the hand was played from the opposite side of the table) got the K of clubs opening lead from his partner -- and held onto the J of clubs for dear life (until the 12th trick, in fact). Hey, come on. Your partner surely has the Q and must be intrusted to guard the second round of clubs.
Another, with the hand played as above, held onto the K & Q of clubs until the last two tricks, having sluffed all hearts by trick 8! I just want to say that you should put off as long as possible discarding cards. There are two basic reasons for this, I would say. First, when push comes to shove and you must discard what appears to be a potentially valuable card, the situation may have been clarified -- either by your partner's discards or by declarer having no more entries to dummy or for perhaps a few other reasons. And secondly, declarer may not know he's got you squeezed.
On the play just described (sluffing all hearts by trick 8), this defender kept all his spades! Now he's looking at A K Q of spades in dummy and has only 3 spades himself. So he can't possibly guard the suit. So it's a little puzzling why anyone would jettison the Q J 9 in a suit where they may be valuable cards to retain the 10 9 5 in a suit where dummy shows A K Q 3!
It was when I went through what a clever defense would be (and how to recognize it) that I realized East would have been squeezed had he jettisoned the spades first. After 8 tricks (the club opening lead and the run of 7 diamonds, dummy sluffing a heart and 3 clubs, the hand would have looked like this:

A K Q 3
8
------
------
J 8 7 4 ------
K Q J 9
------ ------
------ K Q
6
A 7 3
------
10

West has already been squeezed down to only the ability to control spades, as you can see. Now declarer runs three spades, sluffing a low heart and . . . while East sluffs first a heart, keeping Q J, then a club and then . . . . well, what? If a heart, declarer sluffs his 10 of clubs and wins the last two with the A 7 of hearts and, or if East discards a club, declarer sluffs the 7 of hearts and wins the last two tricks with the A of hearts and 10 of clubs. Well done. Well, it would have been if East had discarded properly and declarer had noted the squeeze. And that's the crux of the matter here. I've seen far, far simpler situations kicked away by careless declarers. So this is a third reason to keep threats till the last possible moment. You may indeed be squeezed but declarer may not have been watching, or may have meant to watch but have lost count.
This was the defender who jettisoned his hearts in order to keep three spots in spades. Whether declarer would have effected the double squeeze, we'll never know. But I'll say there's at least a 50% chance that he wouldn't have. It was a non-simultaneous double squeeze.