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Imagine you lead from Kxxx, dummy wins the trick with Qx. Now you really want to know whether partner has the Jack, or declarer has AJx(x). Or say you lead from QJxx, dummy wins the ace, and declarer sets up a long suit so you have to cash out. You really want to know whether partner has the K (cash out this suit) or not (try another suit).
(It is standard to give count if dummy wins the trick with a not so high card, e.g. to give count when dummy wins the trick with J or lower.)
(It is standard to give count if dummy wins the trick with a not so high card, e.g. to give count when dummy wins the trick with J or lower.)
It's standard to give count when dummy wins J or lower, std to give attitude if dummy wins K/A. When the Q wins, however, there is room for difference of opinion, & partnership agreement; I have seen books argue both ways. E.g. if partner led from AJxxx he might just want to know if you have 4 then he doesn't have to get you back on lead, can just cash ace and drop declarer's remaining K.

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