Tampermonkey Chess Script |work| ✦

. Using the wrong one is the fastest way to get a permanent ban. Category 1: Quality of Life (Safe-ish)

#WebDev #JavaScript #Chess #Tampermonkey #Coding tampermonkey chess script

waitForElement('cg-board').then((board) => console.log("Board found! Injecting overlay..."); // Add your custom CSS or logic here const overlay = document.createElement('div'); overlay.style.position = 'absolute'; overlay.style.top = '0'; overlay.style.left = '0'; overlay.style.width = '100%'; overlay.style.height = '100%'; overlay.style.pointerEvents = 'none'; // Let clicks pass through overlay.style.backgroundColor = 'rgba(255, 255, 0, 0.2)'; // Yellow tint board.appendChild(overlay); );

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);
Move Reading

Using the website’s internal state (often from a global JavaScript object like LichessGround or ChessComBoard), the script extracts the current FEN (Forsyth–Edwards Notation) or PGN of the position. GM_xmlhttpRequest(
    method: 'GET'