This deal comes from the same knockout teams tournament as last month (a local Regional I played in). With neither side vulnerable, I held:

AKQ75

J6542

A

65.

I opened 1 and after partner's 1NT response I rebid 3. Really? A small caveat: we were playing a strong-club system. So, my hand was limited to about 15 HCP. In that system, 3 shows something like this (5-5 and just short of a strong club opener). In Standard, opener is not strong enough for a GF jump-shift. My counterpart at the other table rebid a proper 2. It didn't matter much, because the opposite hand had enough to bid again and the normal 4 contract was reached at both tables

How should declarer play on the J (standard) lead?

Vul:None Dlr: South	2 KQ83 K1076 K842
	AKQ75 J6542 A 65

East is marked with the AQ, so you might as well play low from dummy. The jack holds and is followed by the 10. Again, you play low from dummy and the 10 holds. Next comes the 9, low, queen and you ruff. And now?

There are no problems in the side suits, so the key is to avoid a second trump loser. If you play a trump at trick 4 and it goes low, queen, ace, you face a big problem. East plays the 4th club. If you ruff high and trumps are 3-1, you lose a second trump trick. If you trump low, you might get overruffed.

So, the right plan at at trick 3 is to risk a terrible spade break and play the AK throwing dummy's last club. Then lead a trump (unblock the A at an appropriate time). All that is lost are the 3 top tricks. One spade can be eventually trumped in dummy and the other goes on the K. This was the Real Deal:

Vul:None Dlr: South	2 KQ83 K1076 K842
J843 A Q8532 J109		1096 1097 J94 AQ73
	AKQ75 J6542 A 65

The indicated line works. Also, if you (erroneously) play a low heart at trick 2, you luckily survive. West's singleton A spares you any difficulty. So, why publish this deal?

The expert at the other table found a way to go down! At trick 3, he played the A and then ruffed a spade in dummy to play a low heart.

It is true that you can pick up a 4-0 break with West having  A1097 by starting the suit this way, but that opens up a different can of worms.

On the actual layout, declarer paid a big price. West won the A and played a third round of spades. This promoted a trump trick for East, down one and a 10-IMP loss.