The Deschapelles Coup, named after a 19th-century French chess and whist player Alexandre Deschapelles, 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.
|South in 4♦||♠||J 6|
|♥||A J 10 8 3|
|♦||Q 6 2|
|♣||K J 8|
|♠||5 4 3 2||
|♠||K Q 10 8 7|
|♥||Q 5||♥||K 9 6 2|
|♦||J||♦||K 9 7|
|♣||10 9 7 5 3 2||♣||A|
|Lead: ♠2||♠||A 9|
|♦||A 10 8 5 4 3|
|♣||Q 6 4|
Helgemo was East against South's 4♦. West led a small spade, Helgemo put up the ♠Q and South won the ♠A. South then returned a spade to Helgamo's ♠K. Helgemo cashed the ♣A and switched to the ♥K (the coup). Dummy won the ♥A and played the ♦Q to the ♦K, ♦A and ♦J.
Now declarer tried to enter dummy with the ♣K, but Helgemo ruffed, put West in with the ♥Q, and ruffed the club return for down two.
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. South wins West's ♥Q with the ♥A, leads the ♦Q, covered and won, and then leads another heart to endplay Helgemo.
This is a particularly unusual Deschapelles coup, because it is combined with a Merrimac coup. The same play of the ♥K both establishes an entry for West and takes out an entry to dummy.
- "Kudos for a Coup and an Inventor", Alan Truscott, New York Times, June 7 1987
- Daily Bulletin of the Generali World Masters Championship, 19 April 1998.