: Chess sites (like Chess.com) are Single Page Applications (SPAs). If you only run code once, it will disappear when the game refreshes. A MutationObserver detects changes in the page structure and re-applies the script.
To expand this script, you could:
From a technical standpoint, these scripts are difficult to detect because they run on the client-side (the user's browser) rather than the server. However, major platforms have developed sophisticated behavioral analysis algorithms to identify patterns—such as unnatural move accuracy or consistent time intervals—that suggest a script is in use. 3. The Arms Race: Customization vs. Anti-Cheat tampermonkey chess script
: Tampermonkey will automatically detect the script and ask for permission. : Chess sites (like Chess
Chess.com uses behavior analysis: mouse movement patterns, response times, move correlation with top engine lines. Even a “slow” script will be caught if it plays like Stockfish for 20+ moves. To expand this script, you could: From a
document.body.appendChild(Object.assign(document.createElement('button'), innerText: 'Copy PGN', onclick: () => let pgn = document.querySelector('.pgn-text').innerText; navigator.clipboard.writeText(pgn);
Fixes layouts where the board is offset to one side.