mikeh, on 2011-August-18, 08:54, said:
Using 2N to set trump is a precursor to, not a means of avoiding, the use of keycard.
I agree that the hand on which one wants to know Aces and not keycards is rare, but it really isn't esoteric bridge science to agree that 4N caters to that hand while J2N then Ace asking is keycard. Anyone who uses Texas and jacoby, for example, already uses a similar sort of approach: 2 level transfer then 4N is quantitative, 4 level transfer then 4N is keycard. How tough is that to remember?
As for interference, while the odds are that we won't need 4N as just Aces very often, I don't find the chances of a 5-level bid by 4th hand over J2N to happen very often either
I find it funny that people who advocate keycard 4N seem to think that those of us who don't ask for keycards on round one of the bidding intend never to ask later.
Fair enough.
The difference is that quantitative invites after notrump are needed and not uncommon. Asking for aces instead of key-cards on round one and that this difference will matter is seldom and I just dislike having to remember agreements, which may occur once or twice in my remaining life span.
I have enough trouble remembering all treatments, which occur twice per year.
Rainer Herrmann