Posted 2013-August-07, 05:09
After 1♣-1M-2♦, as long as one does away with the obsession about majors, you can do the lot:
2♥ = artificial, showing invitational values (usually 7-8, but can be GF with hands that don't want to get pard excited). Over this, opener bids 2♠(art) or 2NT (nat), with minimum reverses, and everything at the three level is GF.
2♠ = artificial, very weak response (max bad 6). Opener can bid 2NT or 3♣ unless super-strong
2NT = nat, weak, but promises five cards in the major
3♣+, GF
The main thing you get is the extra layer (weak, inv and GF) as opposed to the usual weak/GF arrangement. This allows a slightly more relaxed approach to reversing with decent 4-6 hands with 15 points. But you also get more natural 2NT bids for your money - we don't always have a fit or game after reversing.