Deep Finesse gets this right

But it's harder when you can't see all the cards....

   Dealer East
   NS Vul
   IMP Pairs

           North
           K75
           AK62
           76432
           3
   West               East
   JT62               -
   QT97               J4
   QT                 AKJ8
   764                AQJ9852
           South
           AQ9843
           853
           95
           KT
   West   North  East   South
                 1C!    1S
   Pass!  2S     3C     Pass
   Pass   3H     Pass   3S
   Dbl    All Pass

1C was strong and artificial; West's pass showed any bad hand (less than
a decent 5-count).  NS have no two-suited methods over the strong club;
their bidding was natural.

Q1. What do you think of the bidding, especially by EW?

West led C-4 (count leads).  East played C-A and three rounds of
diamonds, declarer ruffing with S-9 and West discarding H-7 (low
encourages).  Declarer drew three rounds of trumps ending in dummy and
ruffed a diamond; the only additional trick for the defense was West's
high trump.

Deep Finesse says the double-dummy result is 8 tricks.  As far as I can
tell, the defense achieves this only by switching to hearts before
playing the third round of diamonds.

Q2. Can defenders beat the contract without a peek?  How?  Assign the
blame, if you will.