: Depending on the complexity, you might want to inject libraries (like chess.js for working with chess logic) into the page.
function highlightLastMove() // Find move history elements const moves = document.querySelectorAll('.move'); if (moves.length === 0) return;
Once banned, you may lose your account permanently and be IP-flagged. tampermonkey chess script
This is the controversial side of userscripting. Malicious scripts act as a "bridge" between the browser and a local chess engine:
The Intersection of Customization and Competition: Tampermonkey Chess Scripts : Depending on the complexity, you might want
⚠️ Most chess sites (Chess.com, Lichess, etc.) and will ban you. Keep scripts informational only — no automatic or hidden analysis.
const lastMove = moves[moves.length - 1]; // Extract square from move text (simple example) const moveText = lastMove.innerText; const match = moveText.match(/([a-h][1-8])/); if (match) const square = match[1]; const squareElement = document.querySelector(`[data-square="$square"]`); if (squareElement) squareElement.style.backgroundColor = 'yellow'; setTimeout(() => squareElement.style.backgroundColor = ''; , 1000); Malicious scripts act as a "bridge" between the
Example legitimate script: Lichess Analysis Board Enhancer – adds engine eval to all analysis boards without automated moves.