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I know the basic: signal given by both players in a first suit declarer plays in regards whether they liked or disliked the lead.
I'd like to get some more deep stuff, ie. suit combinations where you liked or didn't like the lead. (Which aren't obvious like Qxxx vs. KQxx)
Is there point playing it both in NT and suit contracts? (Especially if you don't otherwise signal in trumps)
How it affects our other signaling? (I've heard many echoers show count when dummy wins the lead and show attitude later)
And other things I don't know and should... (Only regarding Smith Echo please...
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