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Fencer: But imagine the huge amount of data to transfer to the browser if someone starts 1000 games and only a half of them contains a last move message.
Really? The extra amount of traffic would be a single image (which typically will be in the browsers cache anyway), and 500 times an 'IMG' tag in the HTML code. Surely it wouldn't take more traffic than if half of the games where played against opponents that are online?
Personally, I don't care for such an image, and I would use my style sheet to filter it out, but I find the extra traffic argument baffling.