Credits and licences
Last updated 4 October 2026
Knightmotive is built on the work of people who shared theirs. These components are used unmodified unless noted, and each stays under its own licence.
| Component | Use | Licence and source |
|---|---|---|
| Stockfish 19 (also 18 and 10 as fallbacks), in the stockfish.js build by Nathan Rugg | Analysis, game review and the practice opponent. It runs as a separate program in your browser and is downloaded from a public package server. | GNU General Public License v3. Source: official-stockfish/Stockfish and nmrugg/stockfish.js. |
| “cburnett” chess pieces by Colin M. L. Burnett | The pieces on the board. | Offered by the author under the GNU GPL v2 or later, the BSD licence and the GFDL. Source: Wikimedia Commons. |
| GNU FreeFont (FreeSerif) | Outlines for the alternative piece set. | GNU GPL v3 with the font exception. Source: gnu.org/software/freefont. |
| Chess openings database by Lichess | Opening names and book positions. | CC0 (public domain). Source: lichess-org/chess-openings. |
| Inter typeface by Rasmus Andersson | Text. | SIL Open Font License 1.1. |
Method
The accuracy score for a move uses the winning-chances formula published by Lichess. The classic games quoted in the lessons are part of chess history; the commentary on them is our own.
Books
The books named on each stage’s bookshelf are recommendations for further reading. The course teaches the same ideas in its own words and positions and reproduces nothing from them.