🚀 go-pugleaf

Dan Oetting <dan_oetting@uswest.net> wrote:

>In article <19ML5.115383$JS3.17959784@typhoon.nyroc.rr.com>, "Stephen C 
>Morgana" <nospam@nospam.nohow> wrote:
>
>> Hi,
>> 
>> I've encountered a bug in GNU Chess 5.0 on a Sun Sparc Solaris platform 
>>...
>> The problem occurred on move 9 ... Nc6xb5  where it explicitly moved a
>> knight diagonally to capture.  I did not notice the problem (was making
>> moves in between editing/compiling stuff) until move 12 ... b8c6 produced 
>> no
>> visible difference in the board (since b8 was an empty square).
>
>In the rules of chess, you must challange the illegal move before your 
>play otherwise the move stands. An exception is if an inconcistancy is 
>discovered that prevents further play like a king is missing. It does 
>sound like there is a bug in xboard that doesn't handle the situation.

I've seen a similar bug with winboard + olithink.  I didn't care
enough to investigate further, but I have not had a single problem
with xboard + gnuchess4.0.77 or xboard + my own engine when I've
matched them together (couple of thousand games).

>GNU Chess should be carefull where it uses this tactic since there is 
>usually a severe time penalty when it is caught.

hehe

-Henrik Gram