elwood913, on Jan 9 2009, 02:57 PM, said:
Sorry, this is incorrect. Partner's alerts and explanations are UI to him. What makes this complicated is that he's allowed to be "partially" woken up. He should explain his partner's bids in accordance with their agreements, which he's now been reminded of, so that opponents get the same explanations as they would if they read his system notes (for the purposes of discussion, you can assume that the partnership has detailed system notes). But he must continue to bid his hand as if he hadn't heard the alert or explanation -- imagine that you're playing behind screens, or on the Internet with self-alerts.
Screens actually complicate things in a different way. Since you don't hear partner's alerts you never get woken up at all, and you end up giving your screenmate different explanations than the other screenmate. This has resulted in some difficult director calls and appeals in high level competitions.