Caissa Chess Companion

Offline Stockfish 19 analysis with move arrows, opponent predictions, eval tracking, and game reviews for Chess.com and Lichess.

Caissa Chess Assistant Get real-time chess analysis, engine-powered move suggestions, and advanced game insights directly on your chessboard. Analyze positions offline with bundled Stockfish engines, predict opponent moves, detect tactical opportunities, and customize your analysis experience. What's New in Version 3.3.2 Reliability, Opponent Prediction + UI Fixes - Fixed engine crashes and analysis interruptions. - Added automatic fallback between Stockfish 19 and Stockfish 18. - Improved board detection, arrow stability, and orientation handling. - Fixed missing Top Moves cards, Trap Radar, and Draw Advisor. - Fixed Copy PGN and Export PGN to include actual moves. - Improved opponent move predictions using estimated ratings. - Improved opponent move grading and centipawn loss tracking. - Fixed prediction accuracy tracking and dashed arrow rendering. - Improved analysis across multiple open chess tabs. - Added a manual player-color override. - Refined the interface and added guidance for unsupported websites. - Removed the Suggest an Improvement form. - Auto Play remains disabled and marked as Coming Soon. Version 3.3.1 - Added an engine watchdog for improved reliability. - Fixed analysis and arrows restarting after a new game. - Fixed Copy PGN, Copy FEN, and Export PGN. - Added predicted opponent moves with dashed arrows. - Improved turn tracking and board orientation detection. - Added live arrow previews and working appearance controls. - Bundled Stockfish 18 and 19 for offline analysis. - Improved responsive layouts and button sizing. - Removed the music system and puzzle mode. Version 3.3.0 - Added live engine suggestions and board arrows. - Added predicted opponent responses and confidence indicators. - Added material count, evaluation bar, win probability, and evaluation graph. - Added tactical alerts, hanging-piece detection, and opening trap warnings. - Added Draw Advisor and threefold repetition safeguards. - Added Top Moves with candidate lines and evaluation differences. - Added opening names and standard chess notation (SAN). - Added game accuracy comparisons for White and Black. - Added annotated PGN exports with evaluations and move annotations. - Added automatic engine recovery and fallback. - Added sidebar, popup, and floating panel layouts. - Added customizable arrow colors, thickness, animations, and target markers. - Improved position tracking across new games and board orientation changes. - Refined dashboard cards, buttons, typography, and popup layouts. - Fixed multiple stability and display issues.