The purpose of the Cooper echo is merely to provide dummy some relief about the fate of the contract.
Example:
Dummy | ||||
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Declarer | ||||
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West leads the 2 (fourth-best) against 3NT. Declarer can count 9 top tricks, so he plays the
7
4
Note that the Cooper echo is off if declarer needs to unblock the suit, as with an honor doubleton.
The Cooper echo was invented by Peter Cooper of Vancouver, B.C.
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