Author: Telmo C. Escobar
Date: 11:27:49 03/29/05
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On March 28, 2005 at 11:54:35, Jorge Pichard wrote: >87, FQ > >Harry Schnapp released today a new version from his very popular Arena Mainbook. > > Arena Mainbook (detail page, in English and German available) > >This opening book isn't from a PGN file. > I guess this is only partially true (see below). >Harry Schnapp enter each variation in >his book by hand. He is working over one year on this opening book. Harry try >to optimize his opening book for all available chess engines. Critical gambit >openings wouldn't add. > Yes, this is my impression as well. I browsed a bit and it's obvious that Schnapp has been working hard. >This opening book is really a sensation. Shredder 9.0 >produced on my PCs fantastic results with the book from Harry. If I compare the >results with the opening book by Sandro Necchi, the book by Harry produce an >higher Shredder performance (around 20 ELO). > Your results could be so good just by chance. Also I wonder if it is really significant to compare results by such a strong engine like Shredder. >I will not say the book by Sandro >isn't good but many variants Shredder like are deactivated. > >Example: >ATL-2 results: Shredder is playing with Mainbook 4.5 by Harry Schnapp: > >Rating 1: All games from ATL-2 Systems 1 - 3 = 1460 games! >March 26th, 2005 (21:00 MEZ) > > Program Elo + - Games Score Av.Op. >Draws > > 1 Shredder 9.0 : 2750 29 29 420 71.9 % 2587 31.4 >% > 2 Gandalf 6.01 : 2645 28 27 420 56.2 % 2602 32.4 >% > 3 TheKing 3.33 Schumacher : 2621 28 28 400 51.7 % 2609 31.0 >% > 4 Ruffian 2.1.0 : 2606 29 29 380 48.6 % 2616 30.8 >% > 5 ProDeo 1.1 : 2605 29 29 380 48.4 % 2616 31.6 >% > 6 SlowChess Blitz WV : 2560 31 31 360 40.4 % 2628 28.1 >% > 7 SOS 5.1 for Arena : 2547 30 30 360 38.2 % 2630 32.5 >% > 8 Spike 0.9 : 2530 40 41 200 31.8 % 2663 33.5 >% >After 420 games the advantage to Gandalf 6.01 = 105 ELO !! >This games are produced with 40 moves in 20 minutes (still running ATL-2 >tourney). > > ATL League (more information, games, log files and so on) > >On my secret ATL-2a tournament (Athlon 2.8, Centrino 1.6) with Shredder Classic >GUI the different from Shredder 9.0 to Gandalf 6.01 is 82 ELO. After 340 games >for each engine with the same time control 40 moves in 20 minutes. Shredder is >playing with the opening book by Sandro Necchi. I will public this tournament >later. Perhaps I produce other results in tournaments with Fritz, Hiarcs, Tiger >and Junior and perhaps the opening book by Sandro is tuned against this group of >engines. Or simply, around 400 games are not enough. > >FACT is: >The opening book by Harry Schnapp is really a sensation and one of the best >available opening books today! > It could be true that Schnapp's book is one of the best available opening books in Arena format today - one of the eleven or twelve best, it must be :) But I think the book could be not so good if you give it to an engine while the adversary uses a different book. Schnaap's book has apparently too many holes in many openings, because the author's philosophy has been to avoid complicated openings. For example, after 1.e4 e5 2.Nf3 f5, the move 3.Bc4 (that could even be best for White in the Latvian) isn't there. Also, in the Marshall gambit, Schnap's book is not as deep as -I'm guessing- the average book made by other people. This could a problem; in the abovementioned position 1.e4 e5 2.Nf3, the Latvian 2...f5 has probability "zero' of being played, so -I assume- it couldn't possibly happen that an engine plays 2...f5 and gets out of book when the adversary (who uses another book) replies 3.Bc4. But in the Marshall the problem could be real. I'm not claiming that Schnapp's is not a good book- indeed I feel that it is very good despite the above observations. The book has been created this way: firstly the author started with a fairly big PGN file, then he put a great effort hand tuning it, erasing a lot of apparently double edged lines the author didn't like or assumed to be too risky, and adding a lot of other lines the author borrowed from the litterature. It is also my impression that the author examined most -if not all- positions himself. In short, I feel it's an awesome piece of work. Telmo
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