Posted 2006-February-23, 13:45
Well, I think a direct double of 3NT should show a good hand. Usually this involves something in clubs and desire to penalize. So doubling 3NT followed by a double of the run to 4♣ would be penalty. Thus I'd expect a pass of 3NT followed by a double of 4♣ to be responsive. In all:
Pass 3NT, then X 4♣ = responsive takeout (and my call with this hand)
Pass 3NT, then pass 4♣ = normally just a bad hand, maybe willing to defend if partner Xs again
Direct bid over 3NT = natural, tends to be a longish suit
Direct 4♣ over 3NT = multiple places to play, but really should expect to make game opposite a minimum X, thus a better hand than what we were actually dealt
Double 3NT, then bid over 4♣ = really maximum, slam try in the suit bid
Double 3NT, then double 4♣ = penalty, or desire to defend opposite a normal X anyway
While this auction is pretty weird, I think there are some similar sequences that can be used to build general agreements. For example:
(1♦)-X-(1NT)-X.
I take advancer's double here as penalty of 1NT. This shows a good hand, often balanced or with diamond cards. A 2♦ cue can take the place of a "responsive" double. If opponents run from 1NTX, then I would think this is a forcing auction, and that double of 2♦ by advancer is for penalty (unless you typically play takeout doubles in auctions like 1m-X-XX for example in which case pass is desire to penalize).
Adam W. Meyerson
a.k.a. Appeal Without Merit