Author: Albert Silver
Date: 09:25:00 07/25/01
Go up one level in this thread
On July 25, 2001 at 06:40:11, Sune Larsson wrote:
>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
Nice one Sune. :-) One question: can't Black play 9...Be6 and if 10.Bxc6+ Kf8
leaving the pieces en prise and the queen now attacked? I'd have to check it on
a board, but it looks ok at first view.
Albert
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.