Before you start, ensure you have Tampermonkey installed in your browser. Then, you can create a new script by clicking on the Tampermonkey icon in your browser toolbar, selecting "Create a new script," and then pasting the following code into the editor:
// ==UserScript==
// @name Chess Script
// @namespace http://tampermonkey.net/
// @version 0.1
// @description Try to take over the world!
// @author Your Name
// @match https://www.chess.com/*
// @grant none
// ==/UserScript==
(function()
'use strict';
document.body.appendChild(document.createElement('div')).innerHTML = 'Tampermonkey script injected!';
)();
This script does the following:
The metadata block (// ==UserScript== to // ==/UserScript==) provides information about the script to Tampermonkey.
@name and @namespace help identify the script.@version and @description give version information and a brief description.@author specifies who wrote the script.@match indicates on which pages the script should run. In this case, it's set to run on all Chess.com pages.@grant specifies if the script should have any special privileges. Here, it's set to none.The script itself is an immediately invoked function expression (IIFE) to encapsulate its variables and functions, ensuring they don't pollute the global namespace.
Inside the IIFE, it appends a <div> to the body of the webpage, displaying a message.
More Complex Scripts:
For more complex interactions, like analyzing chess positions or suggesting moves, you would likely:
Inspect the Website: Use the browser's developer tools to inspect how the chessboard is represented in the DOM and if there are any existing APIs for move analysis.
Inject Libraries or Code: Depending on the complexity, you might want to inject libraries (like chess.js for working with chess logic) into the page.
Observe and Modify: Use MutationObserver or event listeners to observe changes to the board or pieces and modify the game state accordingly.
Keep in mind that interacting with websites in such a way can be against the terms of service of some platforms. Always ensure you're not violating any rules.
Creating advanced scripts requires a good understanding of both JavaScript and the specific website's structure and APIs.
Tampermonkey scripts for chess are broadly divided into utility scripts (which improve the user interface) and assistance/bot scripts (which use engines to suggest moves) Popular Utility Scripts tampermonkey chess script
These scripts are generally safer to use as they only change visual elements or add convenient links: A.C.A.S (Advanced Chess Assistance System)
: A highly-rated script that provides board analysis and move suggestions using a GUI. Chess Plus+
: Adds features like an "Auto Queue" to join new games faster and a "Lichess Analysis" button to quickly export Chess.com games to Lichess. Shadow Chess Pieces
: A cosmetic script that changes the visual style of the chess pieces with a "shadow" effect. Lichess Analysis for Chessgames.com
: Adds a one-click button to analyze historical games from Chessgames.com directly on Lichess. Assistance & "Bot" Scripts
Using scripts that calculate or play moves for you is considered cheating on platforms like Chess.com and Lichess. These accounts are usually banned quickly. US Chess Sales
Tampermonkey chess script is a custom JavaScript snippet designed to modify the interface or functionality of online chess platforms like Chess.com or Lichess. These scripts run via the Tampermonkey browser extension, allowing users to inject code directly into their browser to change how a site looks or behaves.
While some scripts are used for harmless UI tweaks, others cross into cheating territory, which can lead to permanent account bans. Common Uses of Chess Scripts
Tampermonkey scripts for chess generally fall into three categories: Interface Customization
: Changing piece sets, board themes, or adding coordinates that aren't available in the standard settings. Analysis & Statistics
: Adding "Guess the Move" features, displaying advanced Elo win-probability graphs, or integrating external engine analysis for post-game review. Automation (Botting)
: Highlighting the "best move" on the board during a live game or automatically moving pieces based on engine suggestions. Popular Script Features Custom Board Themes Before you start, ensure you have Tampermonkey installed
: Allows users to use high-resolution textures or classic wood grains not offered by the platform. Move Announcers
: Uses text-to-speech to call out moves, helping visually impaired players or those practicing blindfolded chess. Keyboard Shortcuts
: Adds custom hotkeys for offering draws, resigning, or toggling coordinates quickly. ⚠️ Fair Play & Security Risks
Using Tampermonkey scripts carries significant risks that every user should consider: Account Bans : Major platforms like
have sophisticated "cheat detection" systems. Any script that assists with move selection (even subtly, like highlighting a hanging piece) is a violation of Fair Play policies and usually results in a permanent ban. Malicious Code
: Since these scripts are often hosted on open repositories like GreasyFork or GitHub, they can contain "malware". A poorly vetted script could steal your login cookies or track your browsing data. Site Stability
: Because these scripts "hook" into the website's internal code, site updates often break the scripts, leading to lag, visual glitches, or game crashes during critical moments. How to Use (Safely) If you intend to use a script for visual themes only Install the Tampermonkey extension for your browser (Chrome, Firefox, or Edge). Find a reputable script on GreasyFork Click "Install" and ensure the script's rules only apply to the specific chess site. Test in "Unrated" or "Bot" games first
to ensure it doesn't trigger any unintended automated behavior. specific type of script , such as a custom theme or a tool for post-game analysis?
To "generate a piece" in the context of a Tampermonkey chess script , you are likely looking for a way to programmatically inject or modify a chess piece on a site like Chess.com or Lichess. The most common way to do this is by changing the piece's visual asset (image)
using CSS injection within your script. Below is a foundational piece of code you can use to replace a standard piece (e.g., the White King) with a custom image. Tampermonkey Script: Custom Piece Generator This script targets
to replace the White King with a custom image of your choice. javascript // ==UserScript== // @name Chess.com Custom Piece Generator // @namespace http://tampermonkey.net // @version 1.0
// @description Replace a standard chess piece with a custom image // @author You // @match https://www.chess.com/* // @grant none // ==/UserScript== 'use strict' // 1. Define your custom piece image URL customPieceURL = "https://example.com" // 2. Identify the piece to replace (e.g., White King 'wk') This script does the following:
// Common classes: .wk (white king), .bq (black queen), .wp (white pawn), etc. style = document.createElement( ); style.innerHTML =
` .piece.wk, .sidebar-piece.wk background-image: url("$ customPieceURL ") !important; ` // 3. Inject the style into the page document.head.appendChild(style); })(); Use code with caution. Copied to clipboard Key Elements of the Script Targeting Pieces : On Chess.com, pieces use shorthand class names like (White King), (White Knight), or (Black Pawn). CSS Injection background-image !important
flag ensures your custom image overrides the site's default sprite. Dynamic Links : To use your own images, simply replace the customPieceURL with a direct link to any PNG or SVG file. How to Install Tampermonkey Dashboard in your browser. "Create a new script" Paste the code above and press Navigate to a game on to see the generated piece in action. for pieces each time you load a game?
Here’s a structured guide for creating a Tampermonkey chess script — from understanding what it can do, to writing your first script, and staying within fair play guidelines.
@match lines for URLssetTimeout or MutationObserver for dynamic contentGM_setValue (if needed)A Tampermonkey chess script is a powerful tool—like a scalpel. In the hands of a learner analyzing their own games, it can illuminate hidden tactics and deepen understanding. In the hands of a dishonest player, it becomes a weapon that destroys the spirit of competition.
If you decide to explore scripts:
Chess is beautiful because of human imperfection—the brilliant sacrifice, the blunder, the comeback. No script can replicate the joy of your own hard-fought victory.
What are your thoughts on Tampermonkey chess scripts? Have you used one for training? Share your experience—and always play fair.
Some platforms serve decoy “honeypot” positions—trap positions where the only winning move is unnatural for humans. If your script finds it every time, you’re flagged instantly.
Heavy scripts (e.g., running Stockfish inside a Web Worker at depth 20) can freeze your browser, especially on low-end machines.
Use Lichess’s open /cloud-eval endpoint (no auth required):
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);
);