whereagles, on 2014-October-02, 12:05, said:
In my opinion that's because North didn't use serious when it should have. If 4♦ is mere courtesy, South doesn't want to drive above slam.
But then again, I think standard lore on cuebidding is completely wrong. Shape/strength should come before controls.
I have thought a long time about the issue of whether to focus primarily on shape/strength or primarily on controls. I think that some of the shape/strength people do not appreciate one aspect of the debate, namely that showing controls sometimes has the effect of making shape emerge while showing shape/strength is much less reliable is having controls emerge. As a simple example, knowing that the club suit has no control guarantees 2+ in clubs, which helps to define strength. Also, showing a control in a suit after denying an honor promises a stiff or void and hence tells us about shape. Shape does immediately show "control" in known short suits, but it does not define well xxx versus AKx, for instance. General strength does help define "controls" in a quantitative sense.
Shape/strength, IMO, works best when the starting range is tighter (e.g., strong club systems and a 1-level opening) or when the starting shape considerations are stronger (e.g., canapé with intermediate 2's). The head start means that space is available to fine-tune.
Control bidding is less effective in those situations, IMO, which is why I start initially with shape in those systems, myself. But, standard approaches like 2/1 suffer from wide ranges and quick space consumption. When you have an auction where a 1
♠ opening is 10-22 or so, when 2
♣ as a response is largely unlimited and does not say much about any real pattern, when Opener might rebid 2
♦ or 2
♠ as a waiting call, the auction is hampered a lot as to shape and strength. Granted, shape/strength enables a fast catch-up to some degree. But, shape/strength ends up a matter of more quantitative information rather than fit. It takes too long to get to that issue.
When space is really cramped, though, you almost have to revert to shape/strength.
It's sort of like this, IMO. If you have a great development of basic shape and strength early enough, take advantage of you methods, complete the pattern story, and then have space to move onto fit. If you have a terrible shape/strength development early but a lot of space, control bidding has time to mature in the sequence and works wonders, better than shape/strength catch-up. If you have very little space left, quantitative bash is most reliable with a last-ditch statement of strength/shape.
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