Attributions

RemarkableChess is built on the shoulders of several open works. Thank you to everyone who makes their work freely available.

Chess pieces — Open Chess Font

The chess piece graphics used in all board diagrams are rendered using Open Chess Font by Josh Walters.
The underlying piece designs are attributed to Colin M.L. Burnett (Wikipedia: Cburnett).

Licensed under the Creative Commons Attribution-ShareAlike 3.0 Unported license.
Source: github.com/joshwalters/open-chess-font

Puzzle data — Lichess Open Database

All chess puzzles are sourced from the Lichess open puzzle database, containing over 5 million rated and tagged puzzles.
Released into the public domain under CC0.

Source: database.lichess.org
Lichess is an open-source chess server: lichess.org

PDF generation — jsPDF

PDFs are assembled client-side using jsPDF.
Licensed under the MIT License.
Source: github.com/parallax/jsPDF

Chess move validation — chess.js

Move validation and SAN notation conversion uses chess.js by Jeff Hlywa.
Licensed under the BSD 2-Clause License.
Source: github.com/jhlywa/chess.js