mycroft, on 2012-December-10, 11:00, said:
I (used to) put my (unfolded, proper) CC under my bidding box, with the box covering the leads section. When I defended, I put the contract in, then put it under my bidding box, with the box moved to cover the defensive bidding section. I don't see what the problem is.
Because the opponents might think you are using the CC as a memory aid? The fact that most players with CCs seem to think this is what their cards are for leads me to withdraw the CC (always) and place it somewhere out of their sight. That said, the only pair round here that have a CC plays Precision and even that only gives opening bids and leads. The lady does keep a more detailed CC but it stays on her lap, something I only found out when she tried to get it out and check what her correct Stayman response should be during an auction.
The last non-club tournament I played was a festival affair where the organisers specifically said to us that CCs were not required. Since it is a bit of an effort to make one up in German (I always had a CC in England though) we played without one, instead pre-alerting the major system details. At one table I picked up the opponents' CC and started scanning it for anything unusual. While doing so, my RHO asked aggressively: "And where is yours?". "We don't have one," says my partner. "Then
we don't either says she," snatching it out of my hands and pushing it into her bag. Fair enough. She was not amongst the least amiable there. It was a very "friendly" bridge festival.
Personally I would sooner have the atmosphere of American clubs than open rudeness at the bridge table. That said, if someone is rude then I can be (and am) pretty caustic. That would probably land me a few ZT penalties per year if I ever did play in America. Or perhaps I am overestimating how often these are given out. Certainly there were no ZT fines given out at the festival tournament even though I heard many complaints, particularly about (the wife of) a married couple from Munich (who also happened to finish in the Top 10).