Author: Frank Schneider
Date: 00:02:04 11/03/98
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On November 02, 1998 at 15:37:25, Will Singleton wrote: > >On November 02, 1998 at 04:05:51, Frank Schneider wrote: > >>This was a bug that I was not able to reproduce till now :-( >>It could be something in my WinBoard-code, possibly in combination with >>pondering, but so far I couldn't find anything. >>At home Gromit always wants to play Qe5. Sorry that the bug costed half >>a point. >> >>Frank > >I had just such a bug. On the servers, Amateur would play a crappy move now and >then (more crappy than usual :)), but I couldn't reproduce the bad move offline. > Since I couldn't reproduce it, I couldn't fix it for a good while. So I >eventually had to write some code to mimic a server session, replaying a suspect >game with the same time control, taking the same time to move that the opponent >had in the original game, etc. Turned out to be a problem with the way >pondering used the hash tables, and taking back the move if the guess was wrong. > >Will Thanks Will, I think that is a very good guess. I thought that code was ok, but I'll have a very close look at it again now. Frank
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