The order in which you time the play is flexible. After you win the Ace of diamonds in dummy, lets say you ruff a diamond. You ruff your spade loser in dummy, and ruff another diamond, all following so far. You draw trumps in three rounds, noting that East has a singleton. You play a heart to the Ace, and ruff dummy's last diamond. Both opponents follow to this trick. Counting East's distribution, you know East has 7 spades, 1 club, and has just followed to 4 diamonds. He cannot have more than 1 heart. You can take the heart finesse with confidence, and claim your slam. On the fourth round of diamonds, if East had showed out, you would have counted him for 7 spades, 3 diamonds, 1 club, and therefore 2 hearts, and would have played for the drop in hearts.

Analysis:
A double dummy analysis is not suitable for this problem, as the key to this hand is figuring out the distribution of the heart suit, and looking at all four hands would essentially give away the solution.
Par Contract Analysis:
The par contract on this deal is 6♥ by North-South. In 6♥, the decision in the heart suit has to be taken immediately. In 6♣, declarer has the luxury of drawing trumps, ruffing out dummy's diamonds in order to count the hand, and postponing the decision in the heart suit till the very end.

Bridge Baron deal No : 44165512953295340579233346010