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Delayed preference to strong-jump-shifter's second suit

South
2
A5432
K102
J752
W
N
E
S
1
P
1
P
3
P
3
P
3NT
P
4

 

Here is the problem. Specialized methods aside, in most natural systems (for example BWS) the jump-shift to three clubs does not promise a four-plus-card suit. Given the excellent diamond fit and mediocre clubs, I think responder is justified in giving preference to diamonds rather than directly raising to four clubs. Over three notrump, I deem the South hand as too strong to give up on slam. But he must also introduce his longer clubs in case opener has four-plus-card suit there.

I have spoken to few bidding theorists and they insisted that as soon as responder bid three diamonds, the club train has left, thus his four clubs over three notrump would now show club honor rather than length.

(1) Do Bridge Winners experts agree with that?

(2) (Again specialized methods aside, such as never jump-shifting in non-suits,) Does anybody have a way to deal with this very problem?

(One solution is to jump to six clubs over three notrump. That would be ideal whenever responder thinks that given the bidding so far, grand would be too ambitious, and settling below slam would be too pessimistic. I think this South hand is not that strong.)

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