Tapek, on Nov 11 2009, 06:50 AM, said:
Ok thanks, atm our game is much too simple for 4C or 4NT to have another other meanings then asking for keycards.
Assuming you do play transfers at the 4 level (the majority of people at my local club don't), there's an easy way to remember.
When you transfer is at the 4 level you're saying your suit is trumps, therefore 4NT must be keycard for that suit.
It doesn't make sense to have 1NT-2x-2y-4NT and 1NT-4x-4y-4NT to mean the same thing*, so you have the 2 level transfer and 4NT as quantitative (just as if the rebid was 3NT only stronger).
*If your partnership allows superaccepts, then 4NT after a superaccept is keycard since partner has agreed to that suit.
The slightly more complicated case is after stayman on which you will see a lot of people play 1NT-2C-2M-4NT as keycard for that suit. If you have any non-descript forcing raise (so you can force with some 16 count 4234 if p bids
♠ say), then 4NT should be quantitative, but lacking that, it makes sense to play it as keycard.