In 1994, famed chess teacher László Polgár published Chess: 5,334 Problems, Combinations, and Games.
Of these, 4,462 are checkmate problems. You can play through them here.
If you'd like to use these problems for your own project, simply download problems.json. Enjoy!
To run this locally, run the below and then open index.html in your browser. (You may need Node 14.)
npm install
npm start
- Problem 1071 seems to be mate-in-one (Nc7). I've re-labeled it from mate-in-two to mate-in-one.
- Problem 1325 seems to have two light-square white bishops. This error isn't present in the 1994 edition.
Special thanks to Chris Oakman for his exquisitely documented 2013 chessboard.js and to Jeff Hlywa for chess.js.
Special thanks as well to Christian Kuhn, from whose website I procured polgar.pgn (http://www.qno.de/schach/polgar.zip).
And finally, much thanks to the authors of Stockfish and python-chess.