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Why does GIB prefer a 5-3 fit to 4-4?

#1 User is offline   Siegmund 

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Posted 2012-November-17, 17:21

Like the title says.

Or, put another way, why does the bot think 4H here shows exactly 3, even if normally you'd bid hearts first with 4-4 in the majors? I don't think any of my human partners would bid 4H on 3. Some of them would say this sequence promises 5=4=2=2 some would say it's just 4-4 majors and a reason to insist on the major.

Classic case where hearts plays much better than spades does.

Robot Rebate #7207, board 3.
http://www.bridgebas...3DKH9DQC7DTD9CJ
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#2 User is offline   cloa513 

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Posted 2012-November-17, 18:09

View PostSiegmund, on 2012-November-17, 17:21, said:

Like the title says.

Or, put another way, why does the bot think 4H here shows exactly 3, even if normally you'd bid hearts first with 4-4 in the majors? I don't think any of my human partners would bid 4H on 3. Some of them would say this sequence promises 5=4=2=2 some would say it's just 4-4 majors and a reason to insist on the major.

Classic case where hearts plays much better than spades does.

Robot Rebate #7207, board 3.
http://www.bridgebas...3DKH9DQC7DTD9CJ

NT is not supposed to be a 5-4 hand so it your silly decision.
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#3 User is offline   Jyrki_63 

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Posted 2012-November-24, 13:19

A tip: Mouseover your 3S bid. From its explanation you see that this bid denies a 4 card heart suit (the explanation says 2-3 H). GIB will stick to believing in that. So if you want to show both majors you have to reply 3H to Stayman. No way to show 54. I would not open 2NT with good 54 majors anyway.
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#4 User is offline   Bbradley62 

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Posted 2012-November-24, 14:10

What's with the "5-14HCP" in the descriptions of 3N and 4? Aren't these bids sign-offs? I hope GIB doesn't sign-off in game with 12-14HCP opposite partner's 2N opener.
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#5 User is offline   georgi 

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Posted 2013-January-11, 11:59

View PostBbradley62, on 2012-November-24, 14:10, said:

What's with the "5-14HCP" in the descriptions of 3N and 4? Aren't these bids sign-offs? I hope GIB doesn't sign-off in game with 12-14HCP opposite partner's 2N opener.


It used to overcross explanations with 1N opening.

Fixed so 3N says 5-9HCP ( after 2N opener ). 10-11HCP GIB is supposed to invite for slam (15-16HCP if opener 1N).

#6 User is offline   Stephen Tu 

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Posted 2013-January-11, 15:16

View Postgeorgi, on 2013-January-11, 11:59, said:

It used to overcross explanations with 1N opening.

Fixed so 3N says 5-9HCP ( after 2N opener ). 10-11HCP GIB is supposed to invite for slam (15-16HCP if opener 1N).


Isn't 10 HCP a bit thin for inviting slam over a 20-21 2nt? I'd want at least a good 11 if a flat hand. With 10 HCP I need some long suit source of tricks, GIB needs to evaluate long suits better in general, not just this auction. Maybe 3nt should be 5-11 "total points".

It should probably sim, but with a conservative bias since DD sim is going to assume Qs are routinely guessed on two-way finesse/drop positions and overrate bidding the slam.
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