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GIB playing highest "useless" card

#1 User is offline   pretender 

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Posted 2010-February-08, 18:55

Why is it programmed to do this?
Or rather, in games such as robot races where there are 3 robots, can we turn this feature off?

Example:

Dummy KQJ9xx in a side suit in NT

GIB is behind dummy with Txxx

Declarer (GIB) leads a low one to K on board. The GIB defender plays the T!
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#2 User is offline   barmar 

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Posted 2010-February-08, 23:37

GIB's card play is based on double dummy analysis of hands consistent with the bidding and play so far. I think GIB assumes that declarer is also playing double dummy with the same hand it's analyzing. With that suit, either declarer has Ax, or declarer can lead a low card to knock out partner's now-singleton Ace, and later play the suit from the top. Either way, the Ten will drop, so it seems to GIB that it can never take a trick.

What's really bad is when it takes away your guess in a two-way finesse, because it assumes you're going to get it right.

#3 User is offline   pretender 

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Posted 2010-February-09, 13:50

Yes, it also has a knack of throwing away a 4-3 suit that it sees is breaking 3-3. So if they haven't tossed any, you know it's not breaking.
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#4 User is offline   barmar 

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Posted 2010-February-10, 20:04

Today GIB helped me again with this suit:

I led towards my hand, East correctly ducked, then took his Ace perforce when I played the other honor in my hand. When I later led towards the board, West was kind enough to play the 9, since he knew I would guess right anyway.

#5 User is offline   crazy4hoop 

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Posted 2010-February-10, 20:22

Where's the Jack?
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#6 User is offline   barmar 

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Posted 2010-February-10, 20:33

Knew I was missing something! It was actually:
I remember thinking that it was a nice example of restricted choice, but that doesn't mean I would have gotten it right.

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Posted 2010-March-06, 15:33

Scoring: Total Points


Playing in a robot race GIB North arrives at 4S
South dealer
p-(p)-p-(1d)
x-(2d)-3s-(4d)
4s-ppp

Opening lead DK
Trick 2 HJ, HK, H6, HA!

GIB N had to ruff a diamond, conceding two trump tricks, got the clubs right, but now had a heart loser for down 1. I want to know how reducing 3 heart winners into 2 could be a calculated play that gained in any scenario?
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#8 User is offline   arigreen 

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Posted 2010-March-06, 20:00

It's not clear to me why GIB did this.

Keep in mind that if GIB believes that a certain play cannot cost, it may make that play, even if it doesn't have any evidence that the play will ever gain.
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