Posted 2014-February-13, 07:05
NB: not an expert but I think this is more of an I/A question anyway.
As you can tell, there are plenty of options for these auctions, even given that 2♠ shows a diamond fit (which not everyone does). First of all you need to decide how far 2♠ is forcing. If it is not forcing to 3♦ then you are pretty much left with either:
2NT = min + stopper
3♦ = min without stopper;
or
2NT = weak NT (with or without stopper)
3♦ = real diamonds + min (with or without stopper).
or
2NT = weak NT (with or without stopper)
3♣ = real diamonds + stopper
3♦ = real diamonds + min + no stopper.
Fill in additional bids logically, eg 3♣ = game try; 3♥ = nat and GF; 3♠ = GF, no stopper, not 4♥.
If 2♠ is forcing to 3♦ then we can afford to include more hands in 2NT. If 2NT were bid on any hand with a stopper then all of the other calls now deny one. For example:
2NT = any hand with a stopper
3♣ = game try without a stopper
3♦ = min without stopper
3♥ = GF, nat without stopper
3♠ = GF, no stopper, not 4♥
3NT = GF, half stopper, not 4♥
Alternatively we could differentiate by hand type:
2NT = any balanced hand
3♣ = real diamonds, min, stopper
3♦ = real diamonds, min, no stopper
3♥ = real diamonds, GF, nat
3♠ = real diamonds, GF, no stopper, not 4♥
3NT = real diamonds, GF, stopper, not 4♥
This is only a selection - other possibilities exist. Many will frown upon the use of 3♣ as a game try too; whether that is useful depends to some extent on how low you go for the cue raise. I doubt it matters too much which philosophy you follow so long as it is the same one as partner. For me, schemes 1 and 4 fit best. Whichever one you choose, there are knock-on effects to the follow-ups.
In your case it sounds to me that you are playing something along the lines of structure 1. In that case 3♠ is going to be asking for a half-stopper for 3NT but could yet turn out to be an advance cue.
Finally, in this context "generic game force" means that the hand wants to force to game but has no convenient forcing call to make. Fourth suit forcing could be described this way too and I sometimes teach that it is best to respond to all such 3 level cue bids as if they were fourth suit forcing (unless otherwise agreed). In other words, whatever the structure used, 3♠ is asking whether Opener has a spade stopper within the context of the auction. If a stop has already been denied then a half stop is enough; if not then a full stop is being sought. If we had denied any sort of stop then a cue would be a slam try. By keeping some simple "meta" rules like this you can decipher most such nebulous bids and therefore increase your bidding arsenal as a partnership greatly.
(-: Zel :-)