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Subject: Re: What about the result of game Rebel-Hoffman? (NT)

Author: Ed Schröder

Date: 01:05:40 09/05/99

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On September 04, 1999 at 22:20:18, Robert Hyatt wrote:

>On September 04, 1999 at 21:18:06, James Robertson wrote:
>
>>On September 04, 1999 at 18:24:57, Pierre Bourget wrote:
>>
>>>
>>>On September 04, 1999 at 18:05:04, Paulo Soares wrote:
>>>
>>>>Ed wrote in Rebel Board that Rebel lost after 10 crashes and the moves
>>>>of the game are lost.
>>>>
>>>>Paulo
>>>
>>>I was able to save the moves from ICC.Here is the game:
>>>
>>>Rebel10-5 - Hoffman,A (2524) [A59]
>>>Monthly GM Challenge chessclub.com, 04.09.1999
>>>1.d4 Nf6 2.c4 c5 3.d5 b5 4.cxb5 a6 5.bxa6 g6 6.Nc3 Bxa6 7.Nf3 d6 8.e4 Bxf1
>>>9.Kxf1 Bg7 10.g3 0-0 11.Kg2 Nbd7 12.Re1 Qb6 13.h3 Rfb8 14.Re2 Ne8 15.Bf4 Rb7
>>>16.Qc1 Nc7 17.Bh6 Bh8 18.a4 Qa6 19.Ra2 Rab8 20.Re1 Rb4 21.Qc2 Ne5 22.Nxe5 Bxe5
>>>23.f4 Bd4 24.Bg5 f6 25.Bh4 Qc4 26.Re2 Rb3 27.Nd1 Rxg3+ 28.Bxg3 Qxa2 29.Bf2 Bxf2
>>>30.Rxf2 Rb4 31.Nc3 Qc4 32.f5 Qd4 33.fxg6 hxg6 34.Qe2 Kf7 35.Kh1 Rb8 36.Rg2 Rh8
>>>37.Qg4 g5 38.Qf3 Qe5 39.Rg1 Na6 40.Rg4 c4 41.Kg2 Nc5 42.Qf5 Qd4 43.Kh2 Qe3
>>>44.Rg2 Nd3 45.Nd1 Qc1 46.Nc3 Ne5 47.Ne2 Qxb2 48.a5 Qa3 49.Qe6+ Kf8 50.Nd4 Qc3
>>>51.Qc8+ Kg7 52.Nf5+ Kh7 53.Qb7 Nf3+ 54.Kg3 Nh4+ 55.Kh2 Qe5+ 56.Rg3 Nxf5 57.exf5
>>>Kg7 58.Qa7 c3 59.Qe3 Rc8 60.Qxe5 dxe5 61.Rg1 Ra8 62.Ra1 c2 63.Rc1 Rxa5 64.Rxc2
>>>Rxd5 0-1
>>
>>Quite a nice victory. Did Rebel's crashes cause it to make any really bad moves,
>>or are all good but just not good enough?
>>
>
>
>the bogus hardware likely made it make bad moves...  At one point, Crafty was
>saying -2 (good for black) while Rebel was saying +2 (good for white).  Clearly
>that was wrong...
>
>I have had people run crafty on overclocked AMD processors, and send me log
>files with moves/scores that are absolutely wrong and unreproducible. I think
>he got bit by the same bug.  He also mentioned that in Paderborn (same hardware
>I think) that he saw bogus scores and illegal moves in the PV on occasion...
>
>It was definitely broken...

In Paderborn I used the same machine. In round-1 the game Rebel-Arthur
Rebel showed illegal lines in its main-variations also several unsound
pawn sacrifices. After the game the machine was carefully investigated
by the KryoTech man who was present in Paderborn but no errors were found.

I concluded it was software because some 4-5 months ago I had rewritten
the code of main variation (retrieving the info from the hash table) and
it was logical to assume (at the time) there maybe was a little bug inside.
I should have been more attentive.

Ed




>
>>James
>>>
>>>Pierre



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