🕶️ A view of its UI (on a dark theme) with a game in progress (early game) where I'm playing against the Stockfish AI (I have no illusions about the outcome of the game :)). 📚️ CoreChess is a libre, multi-platform, solo/multi (engine vs engine, player vs player) GUI for playing chess against engines. The Flatpak container includes the Stockfish, Leela Chess Zero and Gnuchess engines, enabling immediate play of standard chess or Chess960. The interface is attractive, drag-and-drop resizable and intuitive. It supports Undo, game saving (PNG format), game playback (FEN format) and game databases. A simple, intuitive interface for immediate solo play only. Very good.