awm, on Jun 18 2008, 02:59 PM, said:
Basically I can see four options here given that I don't like "INV+ relay": (1) continue to use 2/1 GF (2) switch to a method where 2/1 bids are INV+ which ups their frequency and helps with the INV hands, but makes bidding some slam hands more awkward (3) use 1NT as GF relay and the 2/1 bids with INV and weak hands (4) use 2♣ as GF relay and other calls to handle INV and weak hands.
There's also the version where you use 1NT as weak or GF, and 2/1 for invitational hands (F1 or NF to taste, probably 2
♣ is F1 since it might be balanced). This has several advantages -
1. you have a bid for constructive flattish hands without a fit - bid 1NT and either pass, or possibly correct to 2M. This will get you to better partials than just always passing these.
2. handling interference over 1M-1N is better but not great - here there's a big values gap between the constructive 6-9 hands and the 14+ GF hands. There's enough weak hands that crazy interference isn't indicated, and while you lose a forcing pass by opener you can still play either penalty or takeout doubles by responder (to taste) with X and all other bids being unambiguously GF. This is better than dealing with an invitational or maybe GF hand in the same situation where you'll basically be forced to underbid or overbid for lack of space.
3. you can handle invitational hands fairly well in a "Standard style" context, while not being absolutely forcing if opener wants to pass a dog minimum with 3+ cards in your 2/1 new suit.
The main disadvantages of this of course is that your GF relay suffers some and interference is a little more troublesome. Specifically -
1. you lose a forcing pass (FP) over interference. you seem to think this is important, but in my mind it only matters when a) they bid (not that common against me anyway),

we had a hand for whichever of takeout or penalty responder can't show, c) we would have sat for the double, and d) it would have been right. I guess you can start using the FP to describe different hand types that aren't going to penalize too, but I don't think this is the huge loss you think it is (and the field will have your problem too most likely).
2. your cheapest relay bid might be 2M in a purely 1NT GF relay system, but now you might want to allow a preference with a flattish constructive hand. So your relays are up a step sometimes. You can fix this by only bidding 1N on flattish hands that intend to pass rather than pass-or-preference, although I'm not sure this is better for finding good partials.
3. since responder might have a constructive flattish hand, you'll be constrained to have opener's rebids in response to 1NT to be more-or-less natural. High jump bids may be hard to use if they can't tolerate pushing that high when responder is on the weaker hand. You won't be able to use transfers which might have helped on slam sequences.
4. you can't sign off in with a weakish long suit (although I'm not sure you could have done this in a 1NT GF system either, but you can in 2/1). This is much less of a loss playing a limited bid system than it is in 2/1 since in 2/1 opener can have a really big hand and keeping the bidding alive with a random 5-6 count and a long suit might let opener get to game. This pretty much never happens opposite a 10-14 opener, so the only loss in passing is that 1M might be a worse contract than 2X or 3X in your long suit. This might happen sometimes, but the opponents will often balance (since they've got at least half the deck) and then you're off the hook.
Still, I think this is a decent alternative and pretty straightforward. If your priorities are mostly for relay slam bidding and good partials, I think this is a good compromise. You probably get to the field partials, and while your relay isn't always as efficient as the pure GF version, you'll still be starting your relay so low that I expect you can reasonably investigate for slam effectively.