buggnubg - Bugs: bug #56469, Misleading move display


bug #56469: Misleading move display

Submitter:  Tine <tine>
Submitted:  Sun 09 Jun 2019 05:05:04 PM UTC
Originator Name:  Item Group:  * Other bug
Category:  * Other Release:  * 1.00 - 1.05Pre
Privacy:  Public Operating System:  * All
Severity:  3 - Normal Open/Closed:  Open
Assigned to:  None Priority:  5 - Normal
Status:  None
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Tue 11 Jun 2019 08:01:19 PM UTC, comment #2: 

The best play, shown as 6/off, is in fact the perfectly legal 6/4/off.

What is arguably a bug is the way gnubg displays it. This kind of elision is standard when the same checker moves twice (for instance, opening with a 65 : 24/13) but in this position it is indeed confusing.

Fixing it is not entirely obvious. Always displaying all the moves (24/18/13, etc...) is awkward and not what people are used to.

Finding rules that indicate when no to do it might be tricky. When there are wasted pips in a bearoff, as here, seems a good start, but it may not be always necessary, nor cover all cases.

Philippe Michel <plm>
Group administrator
Sun 09 Jun 2019 05:13:15 PM UTC, comment #1: 

Here is a link to the image with the board setup https://drive.google.com/file/d/1UnlETfHnfSQfaGMTDCNvZsMH05r6k_5O/view?usp=sharing. This bug is not allowing me to upload a file.

Tine <tine>
Sun 09 Jun 2019 05:05:04 PM UTC, original submission:  

Release 1.06, Windows 10

The game allows an illegal move, and even suggests it as the best play. We came across it during play, but it can be reproduced by setting up the board and dice as shown in the attached image.

The dice are 6 and 2, but it allows a play where only the 6 is used. There are two ways to use both the 6 and the 2.

Tine <tine>


(Note: upload size limit is set to 16384 kB, after insertion of the required escape characters.)

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    Follow 4 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2019-06-11 plm Operating SystemWindows 7 All
        OS Type64Bit Any
        Processor TypeIntel Any
        SummaryAllows illegal move Misleading move display

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