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What is Responder's 4C double-jump ?


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To me would be splinter.

 

I like 3OM to be undefined splinter, and thus 4 level is void splinter, but absent that agreement, 4 is just a routine splinter.

 

While I use a modified bergen wo competition, I prefer to use fit showing jumps to 3 minor.

 

I can see pros and cons for splinter or fit-showing for 4, if your partnership feels that 3 level jumps are better used for other purposes.

 

Thus I think the answer is: it means whatever you and partner agree, and that such agreement has to include a coherent 2 and 3 and 4 level structure.

 

In a casual expert partnership, I would assume splinter

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I normally play both 3 and 4 as fit jumps. 4 says you want to pre-empt to the four level with a club suit on the side (you can double next round with extra offence). 3 either says you don't want to drive the 4-level or has sound limit raise values and will double/bid game next round to show defence.
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