Caïssa Board

Caïssa Board is a chess interface for playing, studying positions and managing game databases. It highlights tactical ideas directly on the board, supports chess engines and variants, and includes online play through Lichess and its 3D Chess Island club.

Analysis and study

The board highlights forks, pins, threats and hanging pieces on the relevant squares, so you can see tactical motifs without relying only on engine numbers. LLM Analysis Mode uses large language models to evaluate a position based on a chess engine evaluation. The interface supports UCI and CECP engines, including Stockfish and Fairy Stockfish.

You can search PGN databases using built-in filters or custom Lua scripts. The database tools support SQLite and PostgreSQL, and include a database of 2 million games. Position searches can look ahead 20 moves.

Chess Island

Chess Island is a 3D online club set on a sunny, Greece-themed outdoor island. You control a 3D character and walk up to giant outdoor chessboards to open the board interface and play. Casual boards are available for quick matches, while King-of-the-Hill Blitz uses a continuous rotation: the winner stays seated and the next challenger steps up automatically.

Games and variants

You can play online through Lichess in rated or casual games, or against the computer. The game supports 13+ chess variants in 2D and 3D views:

• Chess variants: Standard, Chess960, Antichess, Atomic, Crazyhouse, Horde, Infiltration, King of the Hill, Racing Kings and Three-Check.
• Regional classics: Xiangqi (Chinese Chess) and Shogi (Japanese Chess).
• Expanded board: Capablanca Chess, played on a 10×8 board.

Mods and accessibility

The built-in Mod Manager lets you create custom chess sets, 3D maps and scripts from within the application. You can also use an Unreal Engine project and an open-source GitHub toolkit to create custom PAK files.

Text-to-Speech speaks move names, game status and interface elements aloud for blind and low-vision players.