This deal was played as the Mark Gordon team practiced in New York City (on the way to their victory in the 2013 Transnational teams in Bali, Indonesia). Two different multiple National Champions (who shall remain nameless to protect the guilty) held this hand:

--
AK8
A9843
AK943
With neither side vulnerable, they dealt and opened 1. LHO preempted with 2 and opener's partner raised to 3. RHO now competed with 3. Both openers rebid 4 and eventually landed in 7! Here is what they saw:

J1052 65 KQ52 QT2

-- AK8 A9843 AK943

Please don't ask for the full auction, because it wasn't given to me. I will say that the final contract is a great one. If trumps are 2-2, it is a claim. Even with 3-1 trumps, declarer is likely to make the grand slam by ruffing one heart in dummy and hoping to take 5 club tricks.

After the A lead, what is your plan?

If you're thinking dummy reversal (always a good idea to look for those on published deals), forget about it. There aren't enough dummy entries to make it work. I'll start you out. You ruff the opening lead (good play!) and test trumps. You can't pick up either 4-0 break (that's not the trick to this deal). Trumps turn out to be 3-1 (with the preemptor having the singleton). And now?

Both declarers went astray. They played the A and a club to the queen. What's wrong with that you ask?

Before playing clubs, how could it hurt to test the hearts? Had declarer played A-K-and a heart ruff, he would have gained valuable information. East started with 6 hearts. Assuming spades are 6-3 (from the preempt and raise), declarer has a blueprint of the deal. West seems to be 6=2=1=4. East seems to be 3=6=3=1. Declarer should lay down the A and finesse to the 10 to make the contract. This was the Real Deal (human dealt) from the New York City practice match:

Vul: None Dlr: South	J1052 65 KQ52 QT2
AQ9874 J9 7 J765		K63 QT7432 JT6 8
	-- AK8 A9843 AK943

You can see that the multiple-National Champions failed. When they played the A and then the Q they soon had to go down. There was only one trump in dummy to handle the long club and the heart loser.

Testing hearts first would have led to the winning play. I guess they needed the practice.