Chess has gambits, but bridge? Sometimes. Consider this deal.
♠ Q108
♥ QJ92
♦ 10965
♣ 84
♠ A3
♥ AK
♦ AQ
♣ AKJ10965
You opened 2♣ and ended as declarer in 6NT. The opening lead is the ♥3.
If clubs behave you still have two likely losers and no way to cash dummy's hearts. What to do?
I propose cashing the other top heart at trick 2 and then tabling the ♣J. If the opponent holding the queen ducks it, they are too tough for you and me. Otherwise you'll have a trip to dummy and 12 tricks.