A grand coup is defined as a play, by which the declarer intentionally shortens his trump holding by ruffing a winner in order to achieve a finessing position over an adverse trump holding in an end position.

The following example of a sextuple grand coup is from the publication Bridge á la une authored by Mr. José Le Dentu in the year 1964, published by Fayar of Paris, France. LC: 66055562, ASIN: B005ESHNOY.


Quoted from the publication.

South plays 6 redoubled
West leads: King

Declarer needs to reach a three-card ending, in which both he and West have only trumps left. To that end, the declarer ruffs the lead in dummy and underruffs with the 2 in hand.

He ruffs the Ace and then goes back to dummy four times in hearts, which allows him to ruff five clubs in all. Now he can exit with the Jack and West is endplayed in trumps. Note: the initial underruff is not, strictly speaking a Grand Coup, but there are still five of them!

End quoted text.



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