The size of the database doesn't matter. With a small database size, you could actually do much better than the odds I gave as time goes on by remembering which images are known cats. I was talking straight brute force.

For example, you could always select the top three squares. It doesn't matter how many gazillion of images are in the database, your chances of the three cats being in the top three squares are 1 in 84 (assuming the selection of the squares is random). Selecting three random squares instead of the top three squares does not change the math.

In reply to Re^4: If CAPTCHA isn't the answer. What is? by ikegami
in thread If CAPTCHA isn't the answer. What is? by BMaximus

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