pclayton, on Mar 23 2007, 11:57 AM, said:
I can see 1S - 2C - (2D) -3C - 3S - 4C - 4H - South could take charge with the diamond control but its not easy.
One hand does not prove a point, but...
This is a good example of an auction where pattern bidding is less useful than cuebidding. If one accepts 2♠ as setting trumps (a particularly good idea when a cuebid of their suit is an option when undecided after 2♥), pattern bidding allows showing the stiff diamond but muddies the waters as to the quality of the club honor contribution.
In contrast, consider:
1♠-P-2♣-2♦
2♥-P-2♠(trumps set)-P-
3♣(bypass 2NT -- good trumps; one of top three clubs)-P-3♥(needs diamond control, heart control)-P-
4♣(no third spade honor, not serious -- poor hearts, second top club honor, diamond control)
Notice how nicely this auction progresses. Responder knows Opener's hand nearly exactly, and completely as far as relevant questions are concerned. One unknown is whether Opener has a completely unnecessary third club (a pip); pattern is irrelevant (diamond King works as well as a stiff); as a bonus, Responder knows that the spades are solid between them before even using RKCB.
Slam is quite easily bid. In fact, Responder could confidently bid 6♠ without even using RKCB, except for the problem that Opener might have the diamond Ace or a diamond void. As either would suggest serious interest, however, RKCB is probably useless delay of a completed auction.

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