Open-Source & Third-Party

Attributions

Tactical Path is built with the help of outstanding open-source and third-party projects. We gratefully credit them below.

Stockfish Chess Engine

Stockfish is a free and open-source UCI chess engine, licensed under the GNU General Public License version 3 (GPLv3).

Stockfish is used in Tactical Path under the terms of the GPLv3 license.

Puzzles sourced from the Lichess open database, released under Creative Commons CC0 (public domain).

Embedded video content is served via YouTube's standard embed API and is subject to YouTube's Terms of Service.