# BBO Discussion Forums: 〖美国大师讲座〗精确体系中的无将阶梯 - BBO Discussion Forums

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## 〖美国大师讲座〗精确体系中的无将阶梯 which is best

### #1DJNeill

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Posted 2013-November-06, 18:29

Hi all,

The original NT range in CC Wei precision was 13-15 HCP, possibly because it would allow the simple rule of all 16+ HCP hands opening 1C.

There is a trend in the West to open 1NT with 14-16 HCP in Precision.

Here are a few reasons:

1. When 1NT is 13-15, NT ranges with 16 or more HCP must be stretched and are vulnerable to being lost in interference.

1D-1M-1N = 11-12
1N = 13-15
1C-1D-1N = 16-19
2N = 20-21

Another is:
1D-1M-1N = 11-12
1N = 13-15
1C-1D-1N = 16-18
2N = 19-20

or even:
1D-1M-1N = 11-12
1N = 13-15
1C-1D-1N = 16-18
1C-1D-1H [H or BAL]-1S[forced]-1N = 19-21
2N = 22-23

In each case, the balanced hands that open 1C start at 16.

The problem with stretching the 1C-containing NT range is that when the opponent's compete, opener has a wider range of NT's to cover.

1C-(1H)-X-(2H) and opener may have 16 balanced or 19 balanced, for example.

Or opener may have an unbalanced hand. Opener is already at a disadvantage and this adds to it.

By playing a 14-16 NT, opener will always have 17+ if balanced, which provides more information in competition.

2. By removing 16 HCP balanced hands from 1C, it makes a random 8 HCP response a better promise of game.

Balanced hands have the least trick potential, versus unbalanced hands, on average. If there is no fit, a 16 HCP NT is a disappointment opposite 8 HCP.

By guaranteeing 17+ HCP if balanced, responding hands can upgrade to a positive response more often, which makes it easier to handle competition and get to the right contract.

It is more difficult to handle competition after a 1C-1D than after a 1C-suit positive.

e.g.
xx xxx AKxxx xxx
could gamble a game forcing 2D response to 1C a lot more easily if 1C promised 17+ HCP if balanced. This hand might be lost after 1C-(Pass)-1D-(2S).

Removing the balanced bad hands from 1C makes it easier to guarantee game with any 8 HCP.

The main advantage of 13-15 HCP is that it is more common than 14-16, and thus you can describe your hand more often more quickly with 13-15. However, there is no clear consensus that losing a 4-4 major fit (that you could find with a frequent 1D opening) is worth opening 1NT more often.
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### #2PrecisionL

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• Interests:Diamond LM (5500+ MP) District 7, Unit 165, E. Tennessee

Posted 2013-November-06, 21:42

Dan, In several of my Precision partnerships I have played a 12-15 hcp 1NT. This is too wide a range, so we have gone back to 11-14 and open 1 with 15-16.

Ultra Relay: see Daniel's web page: https://bridgewithda...19/07/Ultra.pdf
C3: Copious Canape is still my favorite system. (Ultra upgraded, PM for notes)

Played Mosca (Nightmare-Fantunes-Millennium like) system with canapé, 11-14 NT.

Santa Fe Precision published 8/19. TOP3 published 11/20. Also Magic experiment (Science Modernized) with Lenzo. 2020: Jan Eric Larsson's Cottontail Club. 2020: C3 Reborn - T-Precision with Relays & 4cd M. BFUN (Bridge For the UNbalanced) 2021: Canape & Strong Relay.
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### #3lycier

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• Joined: 2009-September-28
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• Location:China

Posted 2013-November-07, 03:36

DJNeill, on 2013-November-06, 18:29, said:

Hi all,

The original NT range in CC Wei precision was 13-15 HCP, possibly because it would allow the simple rule of all 16+ HCP hands opening 1C.

There is a trend in the West to open 1NT with 14-16 HCP in Precision.

Here are a few reasons:

1. When 1NT is 13-15, NT ranges with 16 or more HCP must be stretched and are vulnerable to being lost in interference.

1D-1M-1N = 11-12
1N = 13-15
1C-1D-1N = 16-19
2N = 20-21

Another is:
1D-1M-1N = 11-12
1N = 13-15
1C-1D-1N = 16-18
2N = 19-20

or even:
1D-1M-1N = 11-12
1N = 13-15
1C-1D-1N = 16-18
1C-1D-1H [H or BAL]-1S[forced]-1N = 19-21
2N = 22-23

In each case, the balanced hands that open 1C start at 16.

The problem with stretching the 1C-containing NT range is that when the opponent's compete, opener has a wider range of NT's to cover.

1C-(1H)-X-(2H) and opener may have 16 balanced or 19 balanced, for example.

Or opener may have an unbalanced hand. Opener is already at a disadvantage and this adds to it.

By playing a 14-16 NT, opener will always have 17+ if balanced, which provides more information in competition.

2. By removing 16 HCP balanced hands from 1C, it makes a random 8 HCP response a better promise of game.

Balanced hands have the least trick potential, versus unbalanced hands, on average. If there is no fit, a 16 HCP NT is a disappointment opposite 8 HCP.

By guaranteeing 17+ HCP if balanced, responding hands can upgrade to a positive response more often, which makes it easier to handle competition and get to the right contract.

It is more difficult to handle competition after a 1C-1D than after a 1C-suit positive.

e.g.
xx xxx AKxxx xxx
could gamble a game forcing 2D response to 1C a lot more easily if 1C promised 17+ HCP if balanced. This hand might be lost after 1C-(Pass)-1D-(2S).

Removing the balanced bad hands from 1C makes it easier to guarantee game with any 8 HCP.

The main advantage of 13-15 HCP is that it is more common than 14-16, and thus you can describe your hand more often more quickly with 13-15. However, there is no clear consensus that losing a 4-4 major fit (that you could find with a frequent 1D opening) is worth opening 1NT more often.

1- 当1nt=13-15hcp时，16p或16p以上的无将阶梯肯定会被扩大，在受干扰的情况下，很容易遭受损失。

1-1M-1N = 11-12
1N = 13-15
1-1-1N = 16-19
2N = 20-21

1-1M-1N = 11-12
1N = 13-15
1-1-1N = 16-18
2N = 19-20

1-1M-1N = 11-12
1N = 13-15
1-1-1N = 16-18

1-1
1-1
1N = 19-21

（1* =H套或均型,逼叫至1
1*=接力）

2N = 22-23hcp

2- 从1开叫定义中去除16p均型， 就使得任意8hcp应叫都是更好的进局承诺。通常而言，相对于非均型，均型的牌面至少有赢墩的潜力。如果没有花色配合，那么一个16hcp的无将面对着同伴的

8hcp仍是一个令人沮丧的定约。

：xx
：xxx
：AKxxx
：xxx

13-15hcp的主要优点是比14-16hcp更常见，如此一来当你持有13-15hcp时可以更频繁更迅速地描述了。

Dan
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### #4lxl3256

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Posted 2013-November-07, 03:50

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### #5dillon561

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Posted 2013-November-07, 03:58

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### #6dvd

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Posted 2013-November-07, 04:43

jq的13-15的1n，的确存在一些问题；就开叫来讲，选择大nt还是小nt，就个人的认可度而言：可变大小nt>小nt>大nt；
Fantuns体系采用小nt，用作者的原话来讲，根据他的统计，小nt因为被x而造成的损失可以忽略不计，小nt带来的利远大于弊。

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### #7lycier

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Posted 2013-November-07, 11:57

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### #8wuhuan

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Posted 2013-November-08, 00:54

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