Win, play the jack of hearts which west covers, and duck! Say he returns a diamond. Win, cross to dummy with a low club to the jack, cash
♥AK discarding a diamond, and ruff a diamond. Exit a low trump and finesse against west. East wins (best play, otherwise he sacrifices a potential trump trick). If he now cashes the
♠K he's endplayed, so say he plays a low trump. Win the queen and play the good heart.
If east discards, discard a club and cash the ace of clubs before playing another, cashing east in a trump coup.
If east ruffs low, over-ruff and exit another trump, endplaying east.
Become yourself.