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7NT - 13 top tricks, down 5

#1 User is offline   johnu 

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Posted 2012-January-21, 03:56



I don't have a decent understanding how GIB does these hand simulations. 6-2 heart breaks happen 17% of the time, with queen doubleton happening 1 out of 4 times and 7-1 splits are 2.9% with singleton queen happening 1 out of 8 times, so the queen will drop about 4 1/2% of the time. Doesn't it do enough simulations to deal a hand with the queen of hearts dropping in 2 round of hearts in which case no club finesse is needed?

If the queen of hearts doesn't drop, why doesn't GIB run all the winners and take a club finesse at trick 12 which guarantees no more than down 2. And if west has the only spade guard (why did GIB randomly play the 9 of spades at trick 1, that is the spade threat against W) or the queen of hearts along with 4 clubs, there will be a showup squeeze and you can drop the queen doubleton offsides.
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#2 User is offline   cloa513 

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Posted 2012-January-21, 04:28

The simulation part of GIB is scared it won't be able to play the hand as by the fifth last round, GIB apparently changes to estimation of card locations rather than simulations.
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#3 User is offline   uday 

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Posted 2012-January-21, 11:20

I have no idea what the previous poster meant, sorry :)

John, I'm trying to track down the hand record. What sort of game was this? An ACBL Robot Dup? And approximately how long ago?

We'll take a look.
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#4 User is offline   Bbradley62 

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Posted 2012-January-21, 11:24

http://online.bridge...&username=johnu
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#5 User is offline   cloa513 

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Posted 2012-January-21, 20:23

View PostBbradley62, on 2012-January-21, 11:24, said:

http://online.bridge...&username=johnu

GIB is consistantly confused by a 1S overcall as meaning I must have the Queen of clubs so it ignores any other possibility- look at the number of 3NT going down.
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