Ok I'm confused! So what's so new about that huh? I'm trying to play UDCA and odd/even discards. I orginally believed that odd/even applied to discarding on a suit lead which you have a void or played out. In fact Bill Root's book implies that odd/even would be illegal in most US events if used otherwise. Now I am told this is not so.
Does this mean that upside down attitude signals are voided and I have to play an odd card to encourage partner even if I hold the 2 and 4 of the suit. Help a poor very bad defender please.