No, such a chain of captchas is only as strong as its weakest link. They just wait for the captcha they can crack, ignoring the harder questions.Rotsblok wrote:
I think something will be nice if even the possible captcha's rotate.. like at one time you have the image captcha some time later you have the sortable captcha and so on.. So it's even harder to to say well we use this captcha cracker cos you dont know what you encounter...
Unless you've made a typo or I'm missing something bleedingly obvious, who could come up with an answer to that in their head? The answer has a decimal in it for a start. If it was rounded to 50, sure. But 51?Darth Wong wrote:But skill-testing word math problems are a little more effective. On my forum I use the following word problem: "Joe Redneck is driving at 75 mph to his meth dealer 51 miles away. How many minutes will it take?" I don't seem to have much trouble with automated sign-ups.
If I Google that, I actually get a couple of hits on people asking for the answer, which is pretty sad (come on, how retarded do you have to be in order to need help with that question?)
I suppose it depends on whether you want that kind of user to enter. To be brutally honest, I'd prefer to reject the kind of person who considers such a simple question to be too difficult or annoying to answer.SyntaxError90 wrote:The problem with 'skill based' questions is that, unfortunately, some people don't have the skills necessary to answer them. People also don't want to pull out a calculator (or realize Windows and Google both have one built right in) to register for a forum.
That's one of my major beefs with CAPTCHAs which use increasingly hard-to-read text. It's getting so a person who's mildly colour-blind is going to have much more trouble with certain CAPTCHAs than a bot will.Image bases CAPTCHAs bring up a variety of issues, such as accessibly for people who are blind (and in many cases people who aren't blind). When bots are solving captcha more effectively then humans are, we have some major issues here.
My forum happens to be focused on science fiction and science-related issues such as evolution science versus creation BS, so I'd honestly prefer to avoid the kind of person who can't figure out time from distance and speed.Roberdin wrote:Anyone who is not particularly numerically-orientated will not be interested in attempting to solve that problem.
http://www.wolframalpha.com/input/?i=Ja ... ve+left%3FArrnea wrote:I'm in favor of simple mathematical problems, written in words, as a replacement for CAPTCHAs, because some of the designs for the CAPTCHAs are quite difficult to read even with perfect eyesight.
"Jack has six apples. Jack then gives three of those six apples to Paul. How many apples does Jack have left?"
Indeed, but it would be interesting to see how long before it does start calculating Roman numeralsstevemaury wrote:IX + L = ? WolframAlpha can't answer that one.
The problem is the 'L', it assumes it's a variable. IX + LXcherokee red wrote:Indeed, but it would be interesting to see how long before it does start calculating Roman numeralsstevemaury wrote:IX + L = ? WolframAlpha can't answer that one.