Can You Write a Sure-fire Algorithm to Stop Bots?

[BluffTHIS!]

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A high level bot is going to scan the entire application screen and know area zones to look at it, so outside of changing the graphics somehow, I'm not sure you could prevent it. You talk about pixel shaking - well all a bot has to do then is take a screen cap and analyze that - in fact they probably already do do that.

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Obviously a better written bot is going to analyze better, and as you say capture the screen (via scraping) to do so. But my question is whether there is a fairly easy method to either make it take too long to analyze when multi-tabling, or indeed impossible.

Any other knowledgeable programmers out there that can comment?