Author: Robert Hyatt
Date: 05:41:53 05/09/00
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On May 09, 2000 at 02:06:01, Mark Longridge wrote: >> >>It sounds like your book was made from a small set of games, with a lot of >>1. f4 games in it to make that appear the most popular. What did you build >>it from? > >Used the medium book from your ftp site, added all Fischer's games, >all Deep Blue, Kasparov's games, and yes a ton of Bird's Opening >games with 1. f4 > >Never thought that the number of games could decide the frequency >of a particular opening, which does make sense to me. Think about it for a minute. How will the program decide how frequent a particular opening is played... unless it counts the number of times it appears in the PGN input file used to build the book? You have apparently skewed the natural frequency by including all the Bird's openings you could find... It isn't necessarily bad, just odd. you can try adding bookw freq 0.0 to your crafty.rc file, which says "ignore frequency, totally". > My book is >over 33 megs, so I don't think it's a small book. I wanted something >out of the ordinary to mix things up, hence the 1. f4 games. And >indeed, after a ton of bird's opening games, some computers are >ill prepared to fight against it. It has more difficulty against >Nimzo2000 and Gandalf using this opening. > >I also tried experimenting with 1. d3 and 1. a3 with very mixed results. >My conclusion with these oddball openings is that they can win, but >1. a3 seems only barely playable. Compared to really weird openings, >the bird's opening wins just over 50% of it's games. Usually it's set >to play 4 15 and 15 1 time controls, and I'd even go as far to say that >Crafty plays 4 15 better than quicker time controls, especially against >engines like Fritz and Hiarcs. For example, 4 15 seems to go much better >than 5 3. > >But I don't understand the number of Philidor's Defense games, which is >rather drawish (but still a lot better than 1. a3)
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