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◎叫牌理论◎

 

对1NT开叫后部分应叫改动的建议

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。
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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