awm, on Mar 28 2006, 07:56 AM, said:
The rule that I use is basically:
(1) If notrump has been bid, then bidding the fourth suit is as natural as possible (occasionally a three-card fragment) and patterning out.
(2) If notrump has not yet been bid, then bidding the fourth suit is primarily a stopper ask, and indicates a hand with no clear direction.
Again, I wouldn't claim that this rule is standard -- whether the fourth suit is natural or not in standard bidding seems to be more complicated than this.
In Arend's example I prefer to play:
1D-1S-2H-2S-3C: Forcing stopper ask, typically a 2452 hand with weak clubs, or a 2461/1462 hand with weak clubs and extra values (3D would be NF).
1D-1H-1S-1N-2C: Natural, 4144 or the like.
1D-1S-3C-3D-3H: Primarily asking partner to bid 3nt with a stopper. What else would one bid with a minimum game force and no interest in playing spades? Partner will usually bid 3D here with three or more just in case opener has a freak hand (yes preference on 2 also is possible), and many semi-balanced game forces don't want to bypass 3nt.
I basically use the same rule but this auction just feels different to me, given that both players have already made non-forcing bids. Of course it is nice to have a bid for 2254 17-18 with weak spades, so I am far from convinced that natural is the best treatment... On the other hand, the 2254 hand can bid 3D or 3C next with a suitably strong suit, so thats not a huge loss.