Script | Tampermonkey Chess

A small local application (often Python or Node.js based) receives the FEN, passes it to a compiled Stockfish binary, and calculates the best move.

let observer = new MutationObserver(() => if (myTurn && !thinking) startAnalysis(); ); observer.observe(boardContainer, attributes: true, subtree: true ); tampermonkey chess script

: Chess sites (like Chess.com) are Single Page Applications (SPAs). If you only run code once, it will disappear when the game refreshes. A MutationObserver detects changes in the page structure and re-applies the script. A small local application (often Python or Node

: Scripts that add links to external analysis tools like Lichess Analysis from other sites or re-enable basic browser functions like right-clicking. A MutationObserver detects changes in the page structure

It’s wild how much control you have over a webpage once you inject a script. ✅ DOM manipulation ✅ External library injection ✅ Real-time UI overlay

: Setting to document-end ensures the HTML exists before your script tries to modify it.