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In the case of showing an image and giving the user a choice to correctly name it; a bot will have a (in the example case 30%) chance at a guess. You want the user to have to enter the answer by hand, and not select it, for that reason.


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In this case, you're looking for alternatives to Captcha first and foremost. Perhaps have a look into this solution, where some coding smarts are used to determine whether or not someone is a bot. I believe it's called a "honey pot". You'll also find some good solutions in this article, and here's another one. Basically, you're trying to trick the bot ...



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