Author: José Carlos
Date: 13:11:26 01/31/02
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On January 31, 2002 at 14:31:12, Dann Corbit wrote: >On January 31, 2002 at 14:06:10, Chessfun wrote: > >>Sjeng. >> >>The week started badly as I collapsed at work on Tuesday only to wake up in >>hospital to be told my gall bladder was bad. So, after they removed it they then >>let me go home the same day.....modern health care?. >> >>I wasn't sure how much pain I was going to be in and whether I would be able to >>operate Sjeng. As it was, sitting and being able to have something to focuss my >>attention on during the weekend helped. > >Glad that the problem was found and solved. Hope you are back to 100% very >soon. > >>Sat 26 Jan. >>Game 7. >>Sjeng v AvernoX 0-1 >> >>Seems Averno had done some homework on Sjeng's opening book. As black plays >>7.....c5 a move I can't find in other opening book and then Sjeng proceeds to >>stay in book till move 20?. Coming out of book at almost -3.00. Averno stayed in >>book until move 25 and it's first move from book is in the following position. >>As noted by the kibitzed notations following; >> >>[D]r5k1/pp1r1pp1/5n1p/2P5/P1P1p3/4B3/4BPPP/5RK1 b - - 0 25 >> >>--- Game 554: Sjeng vs AvernoX --- >>Sjeng(C) whispers: d13 -2.84 Be2 Rd7 h4 Kf8 a4 Rc8 a5 Rc6 g4 Ke7 Kg2 Ke6 Rd1 n: >>77984732 qp: 22% fh: 87% c-x: 588476 r-x: 417704 1-x: 39905 t-x: 509 egtb: 0 >>time: 116.61 nps: 669109 >> >>AvernoX(C) kibitzes: Depth:0 Ev:-0.01 Time:0.00 Nodes:30 PV: (0 knps) * >>EGTB: 0/0 >> >>Sjeng(C) whispers: d13 -2.78 a4 Re8 h4 Kf8 a5 Re6 g4 Ke7 Kg2 Rc6 Rb1 h5 gxh5 n: >>104951851 qp: 23% fh: 87% c-x: 563810 r-x: 595175 1-x: 34442 t-x: 1107 egtb: 0 >>time: 161.10 nps: 651915 >> >>AvernoX(C) kibitzes: Depth:13 Ev:2.18 Time:183.00 Nodes:98700004 PV:a8e8 >>f1b1 e8e6 h2h4 e6a6 b1b4 g8h7 h4h5 a6e6 e3f4 e6c6 b4b5 * (539 knps) * EGTB: 0/0 >> >>Naturally the opening has already decided the outcome, although Sjeng did manage >>to make it hard for Averno at one point getting it's minus score down to -1.7 >>but was checkmated on move 89. >> >>After this game I was in a bit of panic as Gian-Carlo wasn't available. I looked >>at the two opening books I was using, normal.opn and nbook.bin. And it appears >>the standard normal.opn follows this line, as when I removed it and simply used >>nbook.bin Sjeng would not follow this line. Yet with normal.opn in place it >>almost always followed the line. I deleted the few lines in normal.opn that >>followed this line and although it would still prefer 4. Qc2 I never had time to >>check if this was caused by normal.opn or nbook.bin. >> >>I am curious to know what part of the book was at fault? and whether Averno's >>operator had set up this line, as naturally it was in his book. > >I don't remember GCP's book algorithm. I suspect that both programmers used the >same source for their opening book. Many "automatically generated" opening >books just consider that any move a GM has played must be good, and especially >if it has been played twice. Some opening books do not even consider if the one >who made the book won or lost the game! > >I rather suspect that this was just an example of the difference in quality >between an automatic book and a hand-tuned book. I doubt very much if any of >the amateur programs have any real hand work in their books. My book: - was based in pgn files, having winning side into account - had many lines from Carlos Pesce's excellent book - had some hand tuned lines, that I analyzed myself with four computers at the same time (four different programs, one of which was Averno, just to make sure it would 'understand' the positions), and with a bit of my intuition (not much, though, as my ELO is only about 2150 FIDE) - had tons of automatically learned knowledge. I had a computer running test matches with learning enabled for a week. Do you guess what the opponents were...? :) I had been waiting for this tournament since, in CCT3, I didn't have my new version ready and had to play with an obsolete version. I did my best (considering my lack of time) to well in CCT4. And I believe I did not too bad :) José C. >In this long post: >http://f11.parsimony.net/forum16635/messages/21642.htm >I discuss how Pepito's opening book for 1.42 and earlier had Noah's Arc Trap in >it, *AND* would play the losing side! > >Amateur opening books make for great amusement from time to time. It's just >another element of computer chess that needs more attention from the >programmers.
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