West is a professional poker player when he isn't playing bridge.
Low diamond lead.
You win with the ace, and draw two rounds of trumps on the second of which East discards a discouraging heart.
You cash the other two diamonds discarding a heart from dummy, then exit with a trump hoping that West will open up spades for you or give you the !HQ so you don't need 4 spade tricks. East discards another heart on the last trump. West plays a heart to dummy's Queen, East's King (!) and your Ace.
What do you do in spades?

Help

2NT P 4♣ P
4♥ x 4NT* P
5♥ P 6♣ all pass