Author: Dann Corbit
Date: 11:31:12 01/31/02
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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. 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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