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Chess.com Bot/Cheat that analyzes the best move, now with improved performance, features, and stability.
// ==UserScript==
// @name Chess.com Bot/Cheat (Improved)
// @namespace YourNamespaceHere
// @version 2.0.0
// @description Chess.com Bot/Cheat that analyzes the best move, now with improved performance, features, and stability.
// @author YourName
// @license Chess.com Bot/Cheat © 2025, All Rights Reserved
// @match https://www.chess.com/play/*
// @match https://www.chess.com/game/*
// @match https://www.chess.com/puzzles/*
// @icon data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==
// @grant GM_getValue
// @grant GM_setValue
// @grant GM_xmlhttpRequest
// @grant GM_getResourceText
// @grant GM_registerMenuCommand
// @resource stockfish.js https://cdnjs.cloudflare.com/ajax/libs/stockfish.js/9.0.0/stockfish.js
// @require https://greasyfork.org/scripts/445697/code/index.js
// @require https://code.jquery.com/jquery-3.6.0.min.js
// @run-at document-start
// ==/UserScript==
(function () {
"use strict";
// Load and instantiate Stockfish
const stockfish = new Worker(
GM_getResourceText("stockfish.js") || "https://cdnjs.cloudflare.com/ajax/libs/stockfish.js/9.0.0/stockfish.js"
);
let autoMoveEnabled = false;
let autoRunDepth = 15; // Default analysis depth
let fenCache = ""; // Avoid redundant processing
// Create a minimal UI for interacting with the bot
function createUI() {
const uiContainer = document.createElement("div");
uiContainer.id = "chess-bot-ui";
uiContainer.style = `
position: fixed;
bottom: 20px;
right: 20px;
z-index: 10000;
background: #ffffff;
border: 1px solid black;
padding: 10px;
border-radius: 8px;
font-family: sans-serif;
`;
uiContainer.innerHTML = `
<h4>Chess Bot UI</h4>
<label>
<input type="checkbox" id="toggle-auto-move"> Enable Auto Move
</label><br>
<label>
Analysis Depth: <input type="number" id="analysis-depth" value="${autoRunDepth}" min="1" max="25" style="width: 50px;">
</label><br><br>
<button id="analyze-button">Analyze Current Position</button><br>
<p>Best Move: <span id="best-move">(none)</span></p>
`;
document.body.appendChild(uiContainer);
// Add event listeners
document.getElementById("toggle-auto-move").addEventListener("change", (e) => {
autoMoveEnabled = e.target.checked;
});
document.getElementById("analysis-depth").addEventListener("change", (e) => {
autoRunDepth = parseInt(e.target.value) || 15;
});
document.getElementById("analyze-button").addEventListener("click", analyzePosition);
}
// Fetch the current FEN (board position) from the Chess.com board
function getFEN() {
const fenElement = document.querySelector("chess-board");
return fenElement ? fenElement.getAttribute("data-fen") : null;
}
// Highlight the best move on the board
function highlightMove(from, to) {
clearHighlights();
document
.querySelector(`[data-square='${from}']`)
?.classList.add("highlight-from");
document
.querySelector(`[data-square='${to}']`)
?.classList.add("highlight-to");
// Styling for highlights
const style = `
.highlight-from {
background-color: rgba(0, 255, 0, 0.5);
}
.highlight-to {
background-color: rgba(255, 0, 0, 0.5);
}
`;
const styleElement = document.createElement("style");
styleElement.innerHTML = style;
document.head.appendChild(styleElement);
}
// Clear move highlights
function clearHighlights() {
document.querySelectorAll(".highlight-from, .highlight-to").forEach((el) => {
el.classList.remove("highlight-from", "highlight-to");
});
}
// Perform move using DOM manipulation
function performMove(from, to) {
const fromSquare = document.querySelector(`[data-square='${from}']`);
const toSquare = document.querySelector(`[data-square='${to}']`);
if (fromSquare && toSquare) {
// Simulate click events to move the piece
fromSquare.click();
toSquare.click();
}
}
// Run Stockfish to determine the best move
function analyzePosition() {
const fen = getFEN();
if (!fen) {
alert("Game position cannot be detected. Please ensure you're on a live game.");
return;
}
if (fen === fenCache) {
console.log("FEN unchanged. Analysis skipped.");
return;
}
fenCache = fen;
// Send position to Stockfish
console.log(`Analyzing position: ${fen}`);
stockfish.postMessage(`position fen ${fen}`);
stockfish.postMessage(`go depth ${autoRunDepth}`);
}
// Listen to Stockfish's response
stockfish.onmessage = function (event) {
const data = event.data;
if (data.startsWith("bestmove")) {
const move = data.split(" ")[1];
if (!move || move.length !== 4) return; // Skip invalid moves
const from = move.slice(0, 2);
const to = move.slice(2, 4);
// Update the UI
document.getElementById("best-move").innerText = `${from}-${to}`;
highlightMove(from, to);
// Perform the move if auto-move is enabled
if (autoMoveEnabled) performMove(from, to);
}
};
// Monitor changes on the board and analyze automatically
const observer = new MutationObserver(() => {
// Trigger auto-analysis if auto-move is enabled
if (autoMoveEnabled) analyzePosition();
});
observer.observe(document.body, { childList: true, subtree: true });
// Initialize the script
function initialize() {
createUI();
console.log("Chess Bot initialized!");
}
// Wait for the page to load fully before initializing
if (document.readyState === "complete") {
initialize();
} else {
window.addEventListener("load", initialize);
}
})();