Stockfish and open source

ReChess includes Stockfish 19 (Stockfish.js 19.0.0, lite, single-threaded). Chess analysis runs on the device. Stockfish and the ReChess Stockfish host component are distributed under the GNU General Public License, version 3.

• Read the GPLv3 license
• Download the complete corresponding-source archive (approximately 1.6 MB)
• Provenance, hashes and build instructions (Markdown)

The archive includes engine source, build instructions, the NNUE network, the GPL license and the ReChess engine host-page source. No sign-in or payment is needed.

Notices and provenance

Stockfish © T. Romstad, M. Costalba, J. Kiiski, G. Linscott and other contributors. Stockfish.js © 2026 Chess.com, LLC. NNUE network nn-61e7af4bb97d by Chris Bao (sscg13).

Pinned Stockfish.js upstream source. Stockfish is provided without warranty, including without implied warranties of merchantability or fitness for a particular purpose, as described in its license.

The existing app source link remains available at the legacy Netlify download. Hosting migration must preserve that address.

Website materials

IBM Plex Sans, IBM Plex Mono and Literata fonts are used under the SIL Open Font License: Plex Sans, Plex Mono, Literata. The App Store badge is Apple marketing artwork. ReChess knight artwork is preserved from the approved brand source.

Website libraries: Three.js, GSAP, chess.js. Existing Meridian Shaded piece provenance.

For source-access questions, contact fnissaan@hotmail.com.