N
KJx
AKx
97xx
Kxx

S
Q109xxx
Jxx
Qx
Ax

The defense begin with 3 rounds of diamonds. South ruffs the 3rd round and leads a spade to the king and ace. East exits with the J, which is taken by the ace.
Having lost 3 tricks South must avoid a heart loser. If West holds the Q   he can be squeezed between that and the 4th¨ but can we improve on that?
What if East has the Q don't we have a classic double squeeze with the aid of our old friend the "Vienna coup"
Okay cash the A & K and play off all the trumps but one coming down to this position:
N
None
None
9
K2

S
x
J
None
x
Now on the play of the last trump west has to come down to one club in order to keep the 10 so you ditch the now superfluous 9 and now East feels the pinch. In order to keep the Q he also has to throw a club so the 2 becomes the 12th trick.
!Well played!