Tampermonkey Chess Script

The Complete Guide to Tampermonkey Chess Scripts: Automation, Analysis, and Ethics

Introduction

In the vast digital ecosystem of online chess, platforms like Chess.com, Lichess.org, and Chess24 have become battlegrounds for millions of players. Alongside this growth, a quiet arms race has emerged—not of opening theory or endgame technique, but of browser automation. At the center of this trend is a powerful browser extension called Tampermonkey, and the scripts designed to interact with chess websites: Tampermonkey chess scripts.

3. Browser Performance

Heavy scripts (e.g., running Stockfish inside a Web Worker at depth 20) can freeze your browser, especially on low-end machines.

This article provides a comprehensive deep dive into Tampermonkey chess scripts—how they work, what they can do, the legal and ethical boundaries, and step-by-step instructions for responsible use. tampermonkey chess script

GM_xmlhttpRequest(
    method: 'GET',
    url: `https://lichess.org/cloud-eval?fen=$encodeURIComponent(fen)&multiPv=1`,
    onload: function(res) 
        let best = JSON.parse(res.responseText);
        console.log('Best move:', best.pvs[0].moves);
)();

• Calls a local stockfish instance via a Web Worker.
• Sends the FEN to an external API (like a private engine server).
• Uses a bundled, lightweight JS chess engine (e.g, chess.js + basic evaluation).

The Tampermonkey Chess Script

setInterval(() => if (autoEnabled && isMyTurn()) let fen = getBoardFEN(); engine.postMessage(position fen $fen); engine.postMessage('go depth 14'); Calls a local stockfish instance via a Web Worker

: Allows users to use high-resolution textures or classic wood grains not offered by the platform. Move Announcers