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Confirmed megabug - GIB fails to randomise for restricted choice

#1 User is online   smerriman 

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Posted 2024-January-08, 16:05

According to barmar (and the system notes):

View Postbarmar, on 2023-November-17, 10:43, said:

Actually, it should randomize. Here's the code comment:
/* What do you know about touching honors?  There are three cases:

1. Opening lead (?) or a non-honor.  Play randomly.

2. Declaring.  High if possibly winning and either leading or
following suit.  Low otherwise.

3. Defending.  Leading, play high.  Third play low if possibly
winning, high otherwise.  2nd/4th: If small (you have >= 3 cards) play
the same.  From a doubleton, play random because of restricted choice.  */



I have now confirmed this to be incorrect. When playing in a robot tournament (as opposed to a teaching table), when declarer leads to a trick and a GIB defender holds QJ doubleton, GIB will play Q 100% of the time.

Thus if GIB drops the J, you can take a finesse knowing they can't hold the Q, while if GIB drops the Q, you should play for the drop for better odds, against standard restricted choice advice.

Even if nothing else in GIB is ever going to be touched, can this be fixed?
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#2 User is offline   diana_eva 

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Posted 2024-January-08, 18:26

View Postsmerriman, on 2024-January-08, 16:05, said:

According to barmar (and the system notes):



I have now confirmed this to be incorrect. When playing in a robot tournament (as opposed to a teaching table), when declarer leads to a trick and a GIB defender holds QJ doubleton, GIB will play Q 100% of the time.

Thus if GIB drops the J, you can take a finesse knowing they can't hold the Q, while if GIB drops the Q, you should play for the drop for better odds, against standard restricted choice advice.

Even if nothing else in GIB is ever going to be touched, can this be fixed?


Thanks Stephen, noted and passed to programmers. I dont know yet what, when and how will be touched, related to GIB, but we are paying more attention.

#3 User is offline   lorserker 

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Posted 2024-January-09, 05:18

Thanks for raising.
I will try to find what is causing it and fix it.

Do you have a link to a movie at hand?
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#4 User is online   smerriman 

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Posted 2024-January-09, 13:24

Here's a selection from recent Daylongs:

1 2 3 4 5
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#5 User is offline   lorserker 

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Posted 2024-January-09, 14:14

View Postsmerriman, on 2024-January-09, 13:24, said:

Here's a selection from recent Daylongs:

1 2 3 4 5


Thanks a lot!
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