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Chess books used to develop Stockfish
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New opening book bjbraams_chessdb_198350_lines #18

Closed bjbraams closed 3 years ago

bjbraams commented 3 years ago

Opening book for fishtesting containing 198350 lines, biased and known from human master play. Each line has at most eight full moves (commencing always from the default starting position). 88192 of the lines have at most six full moves, 19424 have at most four full moves and 1286 have at most two full moves. 154148 lines have advantage for white and 44202 have advantage for black. The side that is first to move is the side that has the advantage. The bias (according to dbcn on about 2021-07-19) is distributed as follows: 40cp<=bias<60cp, 47633 cases. 60cp<=bias<80cp, 36462 cases. 80cp<=bias<100cp, 48859 cases. 100cp<=bias<120cp, 37279 cases. 120cp<=bias<140cp, 28117 cases. Openings are distributed as follows: 1. e4, 92647 cases (1. e4 c5, 30183 cases; 1. e4 e5, 20998 cases; 1. e4 e6, 12398 cases, ...); 1. d4, 68815 cases (1. d4 Nf6, 45648 cases; 1. d4 d5, 11793 cases; ...); 1. Nf3, 1. c4 and all other, 36888 cases. The order of lines has been randomized, but the order is preserved between the pgn and the epd version of the book. Further discussion on the Stockfish resources-general-info Discord channel around 2021-07-19; background data on http://chessopeningsforengines.wikidot.com/.

vondele commented 3 years ago

Thanks, these should now be available on fishtest. I propose we use the .epd version, and first perform some experiments

SFisGOD commented 2 years ago

@bjbraams Thank you so much for this book!

bjbraams commented 2 years ago

@SFisGOD, glad that it is useful for you; I noticed that you extracted French and Benoni openings. If you would have use for other customizations just let me know, best on Discord, for instance Stockfish test-discuss, bjbraams there. The context of my efforts is the wikidot site http://chessopeningsforengines.wikidot.com/ and the content of that site (especially under Special Pages) shows the kind of customizations that I do by script. This 198350_lines book was built with scripts for that wikidot site. I just used a very low threshold for popularity in order to get so many lines.

On Mon, Aug 2, 2021 at 7:15 PM Jonathan D. @.***> wrote:

@bjbraams https://github.com/bjbraams Thank you so much for this book!

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