Author: José de Jesús García Ruvalcaba
Date: 09:00:31 04/02/99
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On April 02, 1999 at 02:25:23, Axel Boldt wrote: >Hi, > >I often play gnuchess without paying attention to my time. I noticed >that there's a bug in the program which shows up in certain positions >when I'm out of time. > >This is even reproducible (gnuchess 4.0 pl 79): Start xboard (or >gnuchessn with 5 minutes for 40 moves in "hard" mode so that it thinks >on your time; xboard puts gnuchess automatically in this mode), go to >Mode|Edit Game, and set up the following game: > I reproduced the problem, using gnuchess 4.0.79 under Xboard. > 1. e4 c6 > 2. d4 d5 > 3. Nc3 dxe4 > 4. Nxe4 Nf6 > 5. Nxf6+ gxf6 > 6. Bc4 Rg8 > 7. Qh5 e6 > 8. Ne2 b5 > 9. Bd3 Rxg2 > 10. Be3 e5 > 11. 0-0-0 > >Now start the computer as black (in gnuchessn, say "hard" then "black" >then "go", in xboard go to Mode|Machine Black). It will move > > 11. ... Bg4 > >Now wait about 10 minutes so that your time is at -5 minutes, then >move > > 12. Qxh7 >The computer will now answer either > > 12. ... Bc5?? > >or > > 12. ... Kd7?? > I got Kd7 from my gnuchess. >If you do not wait for 10 minutes (or gnuchessn is not in "hard" mode, >or xboard was started as "xboard -xclock"), then it will move either > > 12. ... Bf3 > >or > > 12. ... Qd5 > I got Bf3. >both of which are clearly much better. > >Is anybody familiar enough with the gnuchess internals to venture a >guess what could be wrong? > I can not explain the problem, but I can confirm it is there. >Thanks, > Axel > >-- > Axel Boldt ** axel@uni-paderborn.de ** math-www.uni-paderborn.de/~axel/ > Sponsor free software at the Free Software Bazaar visar.csustan.edu/bazaar/ I think Stuart Cracraft is working on gnuchess 5.0, but I do not know if he has a release date yet. Wonder if the same problem appears in the new version.
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