Driving a coup(e)

Playing bridge online at OKbridge, Xwing was dealt:
♠A Q 8 5 ♥K 10 8 7 6 ♦Q 8 ♣10 3.

Play along with her.

You pass, left-hand opponent opens 2♦, partner bids 3♣ and RHO raises to 3♦. Over to you.

You can make a case for a responsive double, assuming you play them in this sequence, but 3♥ has a lot going for it in that you have five of them and that is what Xwing bid.

It went all pass and West fired out the ♠J. Here is what you see (hands rotated for convenience):

                ♠ K 7 4
                ♥ 9 2
                ♦ 5 4
                ♣ A K J 7 6 2
===
                ♠ A Q 8 5
                ♥ K 10 8 7 6
                ♦ Q 8
                ♣ 10 3

Declarer won the K in dummy and advanced the ♥9, low, low and won by West with the jack. West now led the ♦K and another to East's ace. East exited with a low spade.

South played the ♠8 which held the trick! She crossed to the ♣A and led another heart, 4, 7 and won by West with the ace. West exited with the ♦J, a club from dummy, East followed with the ♦10 and South ruffed it.

At this point she was pretty sure hearts were originally 4-2, so she cashed the ♠A Q and led a club to the king. At trick 12, she was in dummy with the ♥K 10 sitting over East's ♥Q 5 -- nicely done!

Here are all four hands:

                ♠ K 7 4
                ♥ 9 2
                ♦ 5 4
                ♣ A K J 7 6 2
♠ J 6                          ♠ 10 9 3 2
♥ A J                          ♥ Q 5 4 3
♦ K J 9 7 6 3                  ♦ A 10 2
♣ 8 5 4                        ♣ Q 9
                ♠ A Q 8 5
                ♥ K 10 8 7 6
                ♦ Q 8
                ♣ 10 3

Making plus 140 was good for a 4.81-IMP pickup for Xwing. Her maneuver is called a trump coup.

Correction: Do you see what West could have done? Instead of leading a third round of diamonds, she could have played a club. Xwing can guess to rise with the ♣K, and run clubs (discarding losers), but she has three trumps and East only has two, so the coup doesn't work.

A total of 136 pairs played this board, and you can see all the results here.