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Good question.

A web chess game is turn based with some basic logic to sync the clock. There are no secrets or complex state like many video games. Seems rather straightforward.

The hard part is scaling up everything around it:

- Stockfish real-time predictions

- anti-cheat monitoring

- the moderation tasks any social website needs

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Anti-cheat monitoring can happen after the fact though, and Stockfish can run in-browser (there's a JS-compiled version of it).

Oh cool. Does it run in the browser for This website? That would scale far better.

I believe it does. At least, the better version of this site, lichess, runs the analyzer in the browser.

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