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对1NT开叫后部分应叫改动的建议

Cozofu

 

改动起因:

1.  改应叫人通过2C问高套再叫2NT的无将邀叫。大量成局定约的成败其实就是赌一个首攻,叫得太清楚容易帮助对方找到首攻,这是Grant Baze建议2NT自然的最大原因。

2.改应叫2NT后应叫人再叫花示4441好牌的约定,因为4441牌很少见,使用频率低。

 

1NT-2NT as relay to 3C:

after that:

you can pass with C bust。

bid 3D with D bust。

bid 3H to show 3 hearts and suit oriented hands。

we often open 1NT with 5 card majors。It makes sense to play 1NT-2NT-3C-3H to show 3 hearts and may have 3 spades,suit oriented hands: something like this: Sxx HAxx DAKxx Cxxxx,your partner may have something like this: SAxx HQJTxx DQx CAKx,3NT may have some problem when 4H is cold。)

bid 3S to show 3 spades and suit oriented hands。

bid 3NT to show 2-2-4-5 or 2-2-5-4,mild slam interest。

bid 4C/D to show 2-2-4-5 or 2-2-5-4,good slam invitation。

 

so 2S now is either invitational or both minors strong,or 5-5 minors weak:

With minimum hand,you bid 2NT to sign off。

so responder now can pass with an invitational hand,

bid 3C to show 5-5 weak。

bid 3D to show 5-5 strong,opener can bid 3H to ask for singleton:

responder can bid 3S to show H shortness,3NT S shortness,4C: S shortness

good slam invitation。

 

bid 3H to show singleton,3-1-4-5 or 3-1-5-4。

bid 3S to show singleton,1-3-4-5 or 1-3-5-4。

 

With extra,

opener can bid 3C or 3D to show his preference in minor suit。

over 3C:

responder can pass with 5-5 minors,weak hand。

responder can bid 3D to show 5-5 strong hand。

3H to show 3-1-4-5 or 3-1-5-4。

3S to show 1-3-4-5 or 1-3-5-4。

3NT to show invitational hand。

 

over 3D:

responder can bid 3H/S to show singleton,he can't clarify whether he has 5-4 or 5-5 in minors。

responder can bid 3NT to show invitational hands。

This seems a very elegant structure。

So now we can pretty much play Hardy's structure and make some modifications。

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