A collection of cql scripts for endgame studies in pgn files.
In Müller and Lamprecht's celebrated work "Fundamental Chess Endgames", they show a table on page 11 (this is from the Amazon website free sample of the book). In it, they mention the use of Mega Database 2001, a proprietary database by Chessbase. Obtaining a copy of this to reproduce their table would be ~£100. It's now 2022, and open source chess has come a long way, and now it is trivial to obtain databases 100 times larger than this, completely for free. Namely, Lichess has an open source database of games played on their website. The final piece of the puzzle is finding a way to obtain the required values. For this I used Gady Costeff's CQL : Chess Query Language. The result is a collection of scripts which can be run to analyse how often an ending occurs.
This analysis is not limited to just some big database, this can be done on any pgn file you have available to you!
To install, simply clone the repository
gh repo clone elma16/retiyou will also need cql.
source FCE-table.sh path/to/cql/executable path/to/database.pgn path/to/output/folder halfmoves