A deal from the Chester Congress.
Dealer S N-S vulnerable.
After South's weak two diamonds vulnerable, North pressed on to game.
West cashes the ace and king of hearts with East playing the ten and two.
West now switches to the four of clubs which you win in dummy.
You play two rounds of diamonds with East throwing a club on the second diamond.
How do you play now?
This problem is quite difficult.
It looks as though West is 3631 or 2632 shape, with East being 4216 or 5215 with the queen of clubs.
If you run off all the diamonds except one you can reach the end position below with East to discard.
If East discards a spade then you can ruff out the spades and cross to dummy with the king of clubs to cash the last spade.
If East discards a club then you can cash the top club and return to hand with a spade ruff to cash the jack of clubs.
This rare ending is a trump squeeze.