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Does GIB bid differently based on game type?

#1 User is offline   Rain 

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Posted 2011-April-11, 14:36

The answer is yes.

If you are doing MP vs Total Points/IMP, GIB does evaluate hand differently in the bidding process.
At MP, GIB chooses the contract that works most often.
At TP/IMP, it takes the one with the best avg TP score.

GIB does not consider scoring method in the play/defense yet, afaik, though that's probably coming...
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#2 User is offline   pigpenz 

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Posted 2011-July-17, 08:47

doesnt the GIB.exe allow parameters for imp vs mp scoring when anaylyzing hands
from the dos prompt
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#3 User is offline   Aberlour10 

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Posted 2011-December-01, 15:23

I played a "strange" hand with 3 GIBs today. GIB in N passed>>> GIB E bid 3C >>>HUMAN{me) bid 3H >>>>>GIB in N passed.

After the hand I saw at the Bridge Movie that in exactly same auction GIB N not passed but bid 4H. It happened on 2 tables , 3H was passed on 6. All were an IMP games with human in S.

Just out of curiosity why did it happen?
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#4 User is offline   barmar 

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Posted 2011-December-01, 16:30

Was this a tourney or in the main bridge club?

In the MBC, some users rent advanced robots ($1/day), some rent basic robots ($1/week), and some are using the Windows client that uses the downloaded GIB application, which hasn't been updated in a while. The different levels of robots will bid differently.

Also, if simulations are used in the bidding, the random samples will be different at different tables. In robot duplicate tournaments all the tables use the same deals, but not in the MBC.

#5 User is offline   Aberlour10 

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Posted 2011-December-01, 16:39

View Postbarmar, on 2011-December-01, 16:30, said:

Was this a tourney or in the main bridge club? In the MBC, some users rent advanced robots ($1/day), some rent basic robots ($1/week), and some are using the Windows client that uses the downloaded GIB application, which hasn't been updated in a while.  The different levels of robots will bid differently. Also, if simulations are used in the bidding, the random samples will be different at different tables. In robot duplicate tournaments all the tables use the same deals, but not in the MBC.


OK thanks, now its clear for me. I played in MBC using the Windows client.
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#6 User is offline   BunnyGo 

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Posted 2011-December-01, 16:41

Is it in the works to provide GIB with the "best hand" knowledge? Even just adding that to the simulations might help its gameplay at the tourneys immensely.
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#7 User is offline   barmar 

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Posted 2011-December-01, 16:51

No, there's no current plans to do that.

#8 User is offline   mgoetze 

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Posted 2014-December-13, 23:30

View PostRain, on 2011-April-11, 14:36, said:

At MP, GIB chooses the contract that works most often.

Yes, it seems to prefer a 95% 2 contract to a 90% 1NT contract. This is not proper matchpoint strategy.
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#9 User is offline   barmar 

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Posted 2014-December-16, 10:28

View Postmgoetze, on 2014-December-13, 23:30, said:

Yes, it seems to prefer a 95% 2 contract to a 90% 1NT contract. This is not proper matchpoint strategy.

It does it by estimating the matchpoint score of each contract with simulations, and choosing the one whose average MP is higher.

#10 User is offline   mgoetze 

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Posted 2014-December-16, 13:17

View Postbarmar, on 2014-December-16, 10:28, said:

It does it by estimating the matchpoint score of each contract with simulations, and choosing the one whose average MP is higher.

Well, I don't feel it's doing a very good job of it.
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#11 User is offline   Vampyr 

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Posted 2014-December-16, 15:10

View Postmgoetze, on 2014-December-16, 13:17, said:

Well, I don't feel it's doing a very good job of it.


It is if it's doing its estimating based on other GIBs' bidding. Obviously this circular process is unlikely to change.
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#12 User is offline   steve2005 

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Posted 2017-September-03, 13:42

View Postbarmar, on 2014-December-16, 10:28, said:

It does it by estimating the matchpoint score of each contract with simulations, and choosing the one whose average MP is higher.

Rain - At MP, GIB chooses the contract that works most often.

The 2 are different though they will often result in the same answer.
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#13 User is offline   barmar 

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Posted 2017-October-05, 09:19

View Poststeve2005, on 2017-September-03, 13:42, said:

Rain - At MP, GIB chooses the contract that works most often.

The 2 are different though they will often result in the same answer.

Rain isn't a programmer. She was describing it informally (what does "works" mean in this context?), I was explaining how the code actually works.

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