CHESS is an IOS port of the very strong Stockfish chess engine, combined with a feature-rich GUI.
Features:
- Opening books: Internal, polyglot, CTG
- Clocks
- Analyze mode
- Two player mode
- Edit board
- PGN import/export/edit
- FEN/EPD import
- Adjustable playing strength
- One Touch Moves
- Blindfold mode
- Color themes
- Animated moves
- Scid DB support using "Scid on the go"
- Highly configurable
- Third party UCI engines
- Gaviota endgame tablebases
- Free, GPLv3
The following permissions are used:
Modify/delete SD card contents
To save games to SD card
Full internet access
To optionally communicate with network chess engines
Prevent phone from sleeping
To optionally prevent screen blanking during game play
To optionally vibrate after computer makes a move
Chess is open source. The source code is available from my website.