Author: Sune Larsson
Date: 03:40:11 07/25/01
Go up one level in this thread
On July 25, 2001 at 00:36:00, Dann Corbit wrote: >On July 24, 2001 at 23:06:58, John Hatcher wrote: > >>On July 24, 2001 at 20:57:16, Dann Corbit wrote: >> >>>Not for me, it was asked in this message: >>>http://www.icdchess.com/forums/1/message.shtml?180953 >>> >>>Since the header of that message is not descriptive of the actual problem, I >>>thought I would start a new thread so that the OP might find the answer. >>> >>>I'm pretty well ignornant when it comes to CB. >> >>In all seriousness, why would anyone want to build an opening book from 1.5 >>million games? > >That's a pipsqueak compared to some database files I know of. >I know of one collection with 7.1 million games between rated players. > >>Surely, 1.3 million of the games would be between Joe Blow and >>Norm Nobody. Who cares what they played in the opening? I would be very >>surprised if all the recorded games between International Masters and >>Grandmasters totaled more than 300,000 games. > >Prepare to be surprised. I have 380K in my tiny (highly filtered) set of 2.5 >million games. I throw out any games with the same move sequence. There are >lots of non-duplicate games that get clubbed from that. > >I have about one million games between computer opponents. Perhaps I want to >include those also. > >>I extracted, from a database of 1.5 million games, all the games where both >>players have an actual, or historical (e.g., Capablanca), rating of 2500+ >>There are only about 100,000 games in that book. >> >>I wouldn't want a book comprised of 1.5 million games. There'd be a lot of >>chaff with the wheat. > >Well, to each his own. I wasn't asking for me, but (rather) for someone else. >Anyway, I think it's shortsighted to try to decide what is better for other >people. > >Imagine (for instance) that they want to prepare for someone of ELO 1800 in >their database. They might notice (for instance) that they lose 70% of the time >to the french defense. > >In my case, I intend to (at some point) analyze every move that has ever been >played. I estimate there are about one billion distinct positions in that >category. Wow Dann, analyzing every move that has ever been played... In that case please add the following little curiosity. ;-) It's a game played in the club-ch 30 years ago when I was a very young junior. White: Larsson,S Black: Teikari,H 1.e4 e5 2.Nf3 Nf6 3.Bc4 (always attacking at that time...;-) 3.-d5 (home cooked brewage) 4.exd5 e4 5.Qe2 (played after pondering 30 min - the point of this move is shown in the 9th move.) 5.-Be7 6.Ne5 Qd6 7.Bb5!+ (looks very weird - the white knight is threatened and this move just puts another piece en prise.) 7.-c6 8.dxc6 bxc6 9.Qc4!! (The point - black's double threats are turned into ditto for white, c6 and f7 are hanging + an x-ray attack on c8!) The black player was clearly shocked here and castled - 9.-0-0. After 10.Nxc6 he was two pawns down and white won after 40 moves, 1-0. A nice memory. Sune
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