In bridge, the Deschapelles coup is the lead of an unsupported honor to create an entry in partner's hand; often confused with the Merrimac coup, the lead of an unsupported honor to kill an entry in an opponent's hand.
This sacrificial play was invented by Alexandre Deschapelles, a 19th-century French chess and whist player ,[1][2] Geir Helgemo executed this Deschapelles Coup in a 1998 tournament.
West led a small spade, Helgemo put up the ♠Q and South won the ♠A.
It would not have helped South to duck the ♥K because Helgemo would simply have continued hearts, winding up with a trick in each suit.
And it would not have helped Helgemo to switch to a low heart at trick four.