Although his reputation was thoroughly damaged by the infamous Buenos Aires cheating scandal in 1966, friend and foe agree that Englishman Terence Reese (1913-1996) was a hugely talented bridge player. He declared the deal below during the 1955 World Championship, playing for Great Britain against the USA.

Let us first follow events at the other table where William Rosen (USA) declared the same contract as Reese. Rosen, an acknowledged crack in those days, was totally outplayed by Reese.

E/All		♠	A J 9 3
		♥	K J 8 7 4 3
		♦	A 3
		♣	4
		♠	Q 5 4 2
		♥	A 10
		♦	—
		♣	A K J 10 9 7 6

Rosen won with the ♦A and finessed in trumps. When West followed suit with a small trump and the suit turned out to be 3-2, the slam was made, declarer losing only a spade trick.
The drawback of Rosen's line of play is that, if West were to make the ♣Q, he would certainly play back a spade. Thereafter declarer would very likely be unable to set up the heart suit. After all, South would probably have to pitch spade losers on the heart suit (the chance that South could bring in the spade suit without a loser was remote, especially in view of the bidding). So if the trump finesse were to fail, the ♠K would have to be with West, while the bidding suggested it would not.

At the other table Reese looked much deeper. He realised that he could combine chances: first he could try to drop the ♣Q. If that didn't happen, he could still make the slam in different ways as long as East had the ♣Q (in other words: if the ♣Q was with East, there was no need to finesse for it, since that finesse risked instant defeat if it failed). Reese realised that he could set up the heart suit, provided the ♠A was preserved as an entry in dummy.

E/All		♠	A J 9 3
		♥	K J 8 7 4 3
		♦	A 3
		♣	4
♠	10 8 7 6			♠	K
♥	—			♥	Q 9 6 5 2
♦	K Q J 10 9 7 5			♦	8 6 4 2
♣	8 2			♣	Q 5 3
		♠	Q 5 4 2
		♥	A 10
		♦	—
		♣	A K J 10 9 7 6

Reese ruffed the ♦9 in his hand. The fact that East contributed a small diamond looked odd, but double dummy it makes sense: West hoped for his partner to have the ♦A and wanted to force him to win the lead; of course West was hoping for a heart ruff.
Anyway, Reese ruffed and played the ♣A and the ♣K. When the ♣Q did not come down, he continued with the ♥A and then played the ♥10 to the ♥K. Next came the ♥8, which East had to cover with the ♥9, South ruffing. Then Reese played a trump. East couldn't help but win with the ♣Q and was endplayed.
Now it became clear how deep Reese had been looking. After all, if East were to have three clubs to the ♣Q, as he turned out to have, the rest of the deal played itself. Any card East played back gave declarer the contract. A diamond or a spade would give dummy an extra entry, meaning declarer could set up and cash the hearts. A heart would set up that suit at once for declarer. Whatever happened, South could pitch his three spade losers on the ♦A and two good hearts.
East did his best by returning the ♠K; he could only hope for his partner to have the ♠Q.

Reese's line of play is much better than Rosen's at the other table. The odd thing is that in bridge this doesn't always make a difference. Still, Reese's play was a thing of beauty.