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What is going on here with robot defense? Robot seems to be knowingly throwing at least 2 tricks for no reason w

#1 User is offline   goffster 

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Posted 2024-July-28, 11:19

https://www.bridgeba...CD3%7Cmc%7C8%7C

Not sure if adv robot or not
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#2 User is offline   steve2005 

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Posted 2024-July-28, 15:37

playing the Ten instead of 8
GIB when it has decided it doesn't matter which spot card matters will play the high card.
Sometime this surety of the result costs GIB
Sarcasm is a state of mind
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#3 User is offline   johnu 

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Posted 2024-July-28, 19:45

I depend of defense like that when playing against robots.
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#4 User is offline   s1y4 

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Posted 2024-July-28, 23:42

The GIB may think partner still has heart 9x, so played 10 first then 8 to partner's 9 to avoid an endplay. The trouble is that GIB do not play defense signals.
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#5 User is online   smerriman 

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Posted 2024-July-29, 00:30

View Posts1y4, on 2024-July-28, 23:42, said:

The GIB may think partner still has heart 9x, so played 10 first then 8 to partner's 9 to avoid an endplay. The trouble is that GIB do not play defense signals.

Yep, pretty much this. By my calculations, 8 is better 15% of the time, and T is better 9.5% of the time, with it not mattering the rest of the time; while that makes it more likely it'll play low, that's easily close enough for a free robot to get wrong once in a while. Similar applies to the trick where it dropped the spade later.

(If you didn't pay for the tournament, it's a free robot.)
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#6 User is offline   Aceotto 

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Posted 2024-July-29, 01:23

A hrt was lead robot had a singlton queen and played the king from dummy
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#7 User is offline   Thranduil 

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Posted 2024-July-30, 11:18

Here is another game in which GIB defended poorly: https://tinyurl.com/23prjawg

It should have known that I hold 5 spades topped with the 10-9 sequence (declarer dropped the Q under the dummy's K, I gave a positive signal; and later I lead the 10 and declarer took with the ace) - and yet it decided to block our spades suit by keeping the spare jack and discarding all small spades. This allowed the contract to be made, with proper defense on the bot's side, it would have gone down.
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#8 User is online   smerriman 

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Posted 2024-July-30, 15:14

View PostThranduil, on 2024-July-30, 11:18, said:

It should have known that I hold 5 spades topped with the 10-9 sequence (declarer dropped the Q under the dummy's K, I gave a positive signal; and later I lead the 10 and declarer took with the ace) - and yet it decided to block our spades suit by keeping the spare jack and discarding all small spades.

The robot doesn't make any such cardplay inferences. It does however know for sure that South can't possibly hold four hearts for a 1NT bid, so any case where you hold 5 spades, the opponents are taking every remaining trick whatever it discards.
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