It's related to the 'secret agreements' with partner in this way -   Dummy has  KJ.   Declarer leads toward it,  and has a the AQ guess.  If you hesitate as if thinking of hopping up with the ACE, declarer will be fooled ( what else could you be thinking of?) but your partner won't , he's looking at the ACE !!     Similarly, if dummy J43 of trumps and declarer, holding AK1076, leads the J  and his right hand opponent hesitates as if he was thinking of covering with the Queen ( what else could he be thinking of?) then declare will be fooled but your partner can't be - he's looking at the Queen!.    You were never at risk for fooling your partner.

Why is this type of hesitation considered unethical?
What nodes should I add and what should I change in compositor to get a good bleach bypass film effect?
I would like to have a precise description of all nodes (for example, contrast-10).


