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混和跳扣叫 or 2NT加叫?


zyp163

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我最近在认真学习竞叫方面的内容。2NT就像个橡皮糠,到处存在。

现在它又来了:

 

 

持如下牌:

KJ54

Q3

AJ84

874

叫牌进程:

(1C)-1S-(X)-?

劳伦斯大师提供的新式武器是:2NT

我们用的是混和跳扣叫?

 

 

请教这个进程的渊源。

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