Author: Peter Berger
Date: 02:26:59 12/19/03
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On December 19, 2003 at 00:16:03, Robert Hyatt wrote: >On December 18, 2003 at 18:32:21, Peter Berger wrote: > >>To call Crafty's >>book wide is really wrong - I will try to reach you the last time with this >>message, aware that I am _most_ probably not the first one to come up with this >>anyway. To answer your second question: given 1. e4 e5, Crafy being white: what >>is the probability that it will play 2. Bc4 against a computer? > > >10% of the time: > > move played % score learn CAP sortv P% P > Nf3! 152593 81 0.11 0.27 -655.36 14041.0 90 Y > Bc4! 6913 3 0.07 0.00 -655.36 12046.3 10 Y > >that 3% you are quoting is the "percent of the time this was played >in all the games in enormous.pgn, after 1. e4 e5. Bc4 was played 3% >of the time. Crafty plays it about once out of every 10 games. > >However, once you are past that point, the book is _wide open_. So >I don't understand your usage of the term "narrow". IE from here on >in the game the program can choose from _any_ variation in the Bishop's >opening that it wants... > You are correct with the 10% number for 2. Bc4, I get the same number here. I looked at the wrong column of the table. Why did I call Crafty's book narrow? One example: if 1. e4 e5 2. Nf3 Nc6 is played Crafty as black will _always_ play only the following line against a computer: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 O-O 8. c3 d6 9. h3 Bb7 - there are several similar lines , but I am sure you are aware of this anyway. Or are you? I just had a look at Crafty's most recent games on ICC: CSMath(C)-Crafty 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 d6 glories(C)-Crafty 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 d6 StrongBad(C)-Crafty 1. d4 Nf6 2. c4 g6 These lines would not be possible with the bookc.bin provided for download. Yesterday I had a short conversation with another WB engine author who said that testing against Crafty is mostly useless as it's only a booklearner test - so I am not alone with this observation. >I don't believe we ever discussed how it should be set up. I won't start quoting ;). But it is true that it is a user experiment done by me just as I see fit, although I set up Crafty as closely as possible to your recommendations for an experiment like this. Peter
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