Fast relexes

Playing online last night, I was declarer in 5♠ after the opponents bid diamonds, diamonds and more diamonds. West led the ♥7, an obvious singleton. Here is what I saw:

               ♠ 6 2
               ♥ A 10 9 5 4 3
               ♦ ---
               ♣ A J 9 5 4
==
               ♠ A K 10 8 7 5 3
               ♥ Q 6 2
               ♦ ---
               ♣ 7 6 3

I won the ♥A and cashed the ♠A K, pleased to see the suit split 2-2. Next I advanced a low club and played dummy's 9 which forced the queen. (Yes, I know West could play the queen from ♣Q 10 x, but this is online don't forget.) East tried to cash a diamond. I ruffed and led another club to the 10, jack and king. East cashed the ♥K and I was down one. Here are all four hands:

               ♠ 6 2
               ♥ A 10 9 5 4 3
               ♦ ---
               ♣ A J 9 5 4
♠ 9 4                           ♠ Q J
♥ 7                             ♥ K J 8
♦ J 10 9 8 7 6 5 3              ♦ A K Q 4 2
♣ 10 2                          ♣ K Q 8
               ♠ A K 10 8 7 5 3
               ♥ Q 6 2
               ♦ ---
               ♣ 7 6 3

Minus 50 was a loss of 8.66 IMPs. I was a little annoyed to note that 5♥ was cold. It wasn't until today that a friend pointed out that 5♠ was also cold!

Even though it's a singleton, I need to duck the opening lead. East can win the ♥K, but then what? If he gives West a ruff, I win any return, draw trumps and run the heart suit. All other defenses also lead to 11 tricks.

Winning the ♥A was a reflexive play. Like so many contracts, the play at trick one was crucial.