Author: Peter Kappler
Date: 12:40:32 06/26/05
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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? Is it possible that there was some miscommunication between you and Stefan? Perhaps he would be willing to post an explanation here? -Peter
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