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Re: [Bug-gnubg] Amazing GNU bug

From: Michael Petch
Subject: Re: [Bug-gnubg] Amazing GNU bug
Date: Sat, 17 Sep 2011 14:28:07 -0600
User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv: Gecko/20110902 Thunderbird/3.1.14

On 17/09/2011 1:31 PM, Timothy Y. Chow wrote:
> I then decided to perform a 2-ply evaluation of one of the moves that I 
> had *not* rolled out.  I scrolled down to find "20/14* 3/1" and clicked on 
> it, and then I clicked the "2" button to get a 2-ply analysis.  I got the 
> 2-ply analysis I wanted, but (here's the bug) the dice switched color!  
> That is, instead of two black dice with 2's on them, there were now two 
> *white* dice with 2's on them.
> The most amazing thing, though, was that I then clicked on some other play 
> and clicked the "2" button to get a 2-ply analysis, and now it's somewhat 
> hard to describe what happened.  The computer seems to have treated the 
> play as a play by *White* (after all, the dice are white!) and tried to 
> evaluate it accordingly.  But 20/18(2) is illegal for White to play here 
> because Black owns that point.  Undaunted, GNU relabels the moves with 
> 20/18(2) in them as "20/18*(2)".  Astounding!  What is it doing?
> I'm curious whether you can reproduce my experience.
> Tim

With your file I followed the instructions exactly. Originally I
couldn't reproduce it but then discovered I was using the 20110209
build. I then tried with the latest 20110822 version and it was
reproducible. Although the 20110209 version didn't seem to have the same
issue I did note that in both cases selecting 20/14* 3/1 (28th in the
analysis pane) causes the cursor in the game (move) list to shift from
the right column to the left column (So the cursor is now sitting on the
blank) . In newest releases the dice change color and the state seems to
get mixed up as well. It is definitely a bug. I am currently busy on
something else at the moment but I will put it on the mailing list if
someone wished to investigate.

Michael Petch 
CApp::Sysware Consulting Ltd. 
OpenPGP FingerPrint=D81C 6A0D 987E 7DA5 3219 6715 466A 2ACE 5CAE 3304 

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