Author: Sandro Necchi
Date: 13:10:38 06/26/05
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On June 26, 2005 at 15:40:32, Peter Kappler wrote: >On June 26, 2005 at 14:49:03, Sandro Necchi wrote: > >>On June 26, 2005 at 12:40:38, Peter Kappler wrote: >> >>> >>>>> And I do think you need to give more than one example to support your claim. >>>>>If it was truly a 150-point bug, it should be easy to find several positions. >>>> >>>>By mistake part of the program was deleted. This bug could not be seen at blitz >>>>level and was effecting the game only at high depths. >>>>It was related to pieces exchange handling info, this is why it was not able to >>>>see deeper on tactical combination if involving pieces exchange and was giving >>>>away pawns without compensation in some positions. >>>> >>>>> >>>>>It is strange that Stefan makes no mention of such a serious bug in his >>>>>post-match report. >>>> >>>>Well, he was not pround to discover that, but you can ask him. >>>> >>>>I found this problem after the 2004 WCCC and he did not believed me as all he >>>>did to the program was improving something. Yes, but by mistake he removed part >>>>of the program. >>>>So, the same version got 2nd at the 2004 WCCC and I really don't know how that >>>>was possible...I guess a lot of luck. >>>> >>> >>>Or maybe the bug wasn't quite as harmful as you think? What you describe above >>>sounds a like a problem with a recapture extension, not something that would >>>reduce playing strength by 150 ELO. >> >>Well, it the program performs about 150 points elo less in matches I do not care >>if it should not do this. The score are facts, what a bug can do or not it could >>be a matter of opinions. >> >>I told you what Stefan told me when he found the problem. Previously I could >>only see that it was playing a lot weaker in some positions, but could not >>understand why. >> >>Sandro >> > >I find it hard to believe that the best chess programmer in the world showed up >at the 2004 WCCC with a bug so severe that it weakened his program by 150 ELO >and he didn't even know about it. Are you telling me that he entered this >version of Shredder in the WCCC without doing any testing? This bug could not be seen in blitz games so I was the only one to see it as I only make tests at long time controls. Well, this is how it went. > >Is it possible that there was some miscommunication between you and Stefan? >Perhaps he would be willing to post an explanation here? No, he never made such a mistake and could not believe to have made it until evidence made him think otherwise. > >-Peter Sandro
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