Thanks
ajedrez.dev is made possible by great open-source projects and generous platforms. We are grateful to their authors and contributors.
Open-source software
Stockfish
The chess engine that analyses your games and checks the solutions, running in your browser. Free software under the GPLv3; this build comes from stockfish.js.
chess.js
The rules of chess: legal moves, checks, PGN and FEN.
Chessground
The board you play on, open-sourced by Lichess.
Pieces and sounds
Staunty
The Staunty pieces, by sadsnake1, under CC BY-NC-SA 4.0.
Platforms
Lichess
Sign-in, the game export that turns your games into puzzles, and the puzzle database behind the starter puzzles.
Chess.com
The public API that lets you import your Chess.com games.