Stockfish Chess Engine

Take your Chess.com games to Grandmaster level instantly with the Stockfish Chess Engine Chrome extension: the lightweight, privacy-first tool that brings the world's strongest open-source chess engine directly onto your Chess.com board.

No tab switching. No external analyzers. No premium subscription needed. Just pure, lightning-fast Stockfish analysis with beautiful visual best-move overlays, fully customizable controls, and a detailed list of suggested moves that all run locally in your browser.

Powerful Features for Every Skill Level:
- Real-Time Visual Best Move Overlays: As soon as a move is played, Stockfish instantly highlights the strongest move with a clear arrow highlighted directly on the Chess.com board. Perfect for blitz, rapid, daily games, and any real-time move review.
- Choose Analysis Depth: Set the search depth (e.g., 10–30+ ply) where higher depth delivers more accurate evaluations and stronger move recommendations, while lower depths give faster results.
- Set Think Time: Adjust the time Stockfish spends calculating (in milliseconds) to balance speed vs. strength based on your hardware and game time control.
- Detailed List of Top Moves: The menu displays a ranked list of the best moves with centipawn evaluations, principal variations (multi-line PVs), and scores. Quickly compare alternatives, explore sidelines, and understand why one move outperforms another.
- Seamless Chess.com Integration: Works automatically on live games, analysis boards, puzzles, and reviews. Detects the current position via FEN and delivers instant feedback without cluttering the interface.

Why Chess Players Love This Stockfish Extension:
- Train Like the Pros: See Grandmaster-level insights in real time – improve tactical vision, opening preparation, middlegame planning, and endgame technique.
- Flexible & User-Controlled: Whether you want quick suggestions during a 3+0 blitz game or deep 20+ depth analysis during a long think, the menu gives you full control over time and depth for personalized results.
- Clean & Non-Intrusive: Visual arrows on the board + a powerful yet simple menu for the move list and settings. No side panels, no bloat – just the engine help you need.
- Privacy First & Lightweight: Runs entirely client-side with zero data collection, zero tracking, and minimal permissions. Your games and analysis stay completely private in-browser.
- Free & Optimized: Powered by the latest Stockfish engine optimizations. Small footprint (under 513KB) and fast loading.

Perfect For:
- Blitz & Rapid Training: Quick depth/think time settings for real-time help under pressure.
- Opening Repertoire Building: Explore multiple lines from the move list.
- Puzzle Solving & Verification: Confirm your ideas against Stockfish’s top recommendations.
- Rating Improvement: Faster progress by understanding the “why” behind every best move.

How It Works (Super Simple):
- Install the Stockfish Chess Engine extension from the Chrome Web Store.
- Open any Chess.com game or analysis board.
- The extension automatically activates and shows best-move arrow for both sides.
- Click the extension icon anytime to open the menu → adjust depth and think time → view the full list of top moves with variations and evaluations.
- Play smarter immediately.