I know that the ones on lichess use an algorithmic that finds puzzles in games played by real players on the platform. Code here: https://github.com/ornicar/li

I know that the ones on lichess use an algorithmic that finds puzzles in games played by real players on the platform. Code here: https://github.com/ornicar/lichess-puzzler https://github.com/ornicar/lichess-puzzler You can even see puzzles by player: https://lichess.org/training/of-player https://lichess.org/training/of-player