4462 Chess Problems
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!
Possible Errors in Book
- Problem 1071 seems to be mate-in-one (Nc7). I've re-labeled it from mate-in-two to mate-in-one.
- Problem 4362 seems to be mate-in-two (Qf1, Kxg4, Qf5). I've re-labeled it from mate-in-three to mate-in-two.
Special thanks as well to Christian Kuhn, from whose website I procured polgar.pgn (http://www.qno.de/schach/polgar.zip).