Legacy Chess Engines bundles 10 strong UCI chess engines for use with Android chess GUI apps like Chessis, DroidFish, and Chess for All.

Simply install this app, then open your chess GUI and select an engine from Settings. The engines are automatically discovered via the Open Exchange (OEX) protocol — no manual setup needed.

INCLUDED ENGINES:

• Stockfish 17.1 — Latest and strongest, with embedded NNUE neural network
• Stockfish 15.1 — NNUE available via optional download (~45 MB)
• Stockfish 14.1 — NNUE available via optional download (~45 MB)
• Stockfish 13 — With embedded NNUE
• Stockfish 12 — With embedded NNUE
• Berserk 13 — Strong NNUE engine by Jay Honnold
• RubiChess — NNUE engine by Andreas Matthies
• Koivisto 9.0 — NNUE engine by Kim Kahre and Finn Eggers
• Fruit 2.1 — Classic engine by Fabien Letouzey
• Toga II — Classic engine by Thomas Gaksch

FEATURES:

• Works with any chess app that supports the OEX protocol
• Supports arm64-v8a, armeabi-v7a, x86, and x86_64 devices
• NNUE neural network evaluation for stronger play
• Optional NNUE downloads keep the initial install size small
• No ads, no tracking, no data collection

HOW TO USE:

1. Install this app
2. Open your preferred chess GUI (Chessis, DroidFish, Chess for All, etc.)
3. Go to Settings and choose an engine
4. The engines from this app will appear automatically

All engines are free and open source, licensed under the GNU General Public License v3.0 (GPLv3). Source code is available from the original authors' repositories.