The important thing everyone can learn from this isn't that a chess captcha might work for every site, but rather that there's a lot of potential for sophisticated captchas that are better than the ones that are currently being used (math, image recognition etc.) - a large variety of completely different ways to prove that you're human makes automatic attacks harder.
Chess CAPTCHA
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Re: Chess CAPTCHA
#92Great, I like this a lot. It is much better than those horrible squiggly characters in invisible colour combinations.
As an added bonus on, say blog comments, this could filter out obvious idiots.
Consider offering a choice of a few different puzzles for those who don't play chess?
Re: Chess CAPTCHA
#93Earlier quoted context omitted.
Sure you can. You're just adding two (probably normal-ish) distibutions: the distribution of human response times for processing the chess move, and the distribution of human response times for parsing the instructions.
Human response times are almost never normally distributed. They can't be, as a matter of fact as negative response time is an impossibility. In any case, they are typically long tailed and weird looking. Not normal, at least in my experience of working with them
You are right, of course, and I knew I was going to regret the use of even the toned-down term "probably normal-ish". The question is whether the one can meaningfully ask which text is faster to parse, despite the "noise" the comes from the time to actually perform the chess move. I suspect the answer will be 'yes'.
Re: Chess CAPTCHA
#94Brilliant building of software. Less than brilliant copy. I would change Black plays; checkmate in one! This is a chess CAPTCHA. Click on the board to make your move, and prove you are human. to This is a chess CAPTCHA... To prove that you are human, click on a black piece, then click on the only destination square that will checkmate. I really don't mean to nitpick, but took me a minute to figure out what to do. Som…
I don't see there any need for a change
Black plays; checkmate in one!
Re: Chess CAPTCHA
#95A fun novelty but not an effective CAPTCHA if it ever caught on. It would be trivial to crack
Re: Chess CAPTCHA
#96Screen readers have already been mentioned. But also, how about people from cultures that don't play chess? How about people from cultures that do play chess that just haven't ever given time to the game?
I learned to play chess when I was a kid, but never had anyone to play with. The internet wasn't any help, either, because when you're a kid it's just not that much fun to constantly have your ass handed to you in a game. I gravitated to other games as a result. And now this thing just gives me that same sense of dread, of "I have no idea what the hell I'm doing", even though I know all of the rules of the game, because I'm so not involved in the culture of the game at all.
Congrats, you've alienated several classes of users.
Re: Chess CAPTCHA
#97Interestingly enough, it looks like it has a specific checkmate in mind. It generated a board for me in which black could be mated in two different ways, but one didn't count.
Re: Chess CAPTCHA
#98Screen readers have already been mentioned. But also, how about people from cultures that don't play chess? How about people from cultures that do play chess that just haven't ever given time to the game? I learned to play chess when I was a kid, but never had anyone to play with. The internet wasn't any help, either, because when you're a kid it's just not that much fun to constantly have your ass handed to you in a…
the CAPTCHA is for posting in a chess forum :)
Re: Chess CAPTCHA
#99Brilliant building of software. Less than brilliant copy. I would change Black plays; checkmate in one! This is a chess CAPTCHA. Click on the board to make your move, and prove you are human. to This is a chess CAPTCHA... To prove that you are human, click on a black piece, then click on the only destination square that will checkmate. I really don't mean to nitpick, but took me a minute to figure out what to do. Som…
I don't see there any need for a change Black plays; checkmate in one! This is the most obvious form for chess players; universally used throughout many chess quiz books.
Uh, if it's a CAPTCHA intended to be usable by those who know chess as opposed to those who actually play chess then yes, they should probably ask for what they actually want instead of saying something that will lead the user to the right assumption.
Of course if it's really "CHESS player CAPTCHA" then I could be way off...
Re: Chess CAPTCHA
#100Brilliant building of software. Less than brilliant copy. I would change Black plays; checkmate in one! This is a chess CAPTCHA. Click on the board to make your move, and prove you are human. to This is a chess CAPTCHA... To prove that you are human, click on a black piece, then click on the only destination square that will checkmate. I really don't mean to nitpick, but took me a minute to figure out what to do. Som…
No need. Given the demographic targeted, the current text is sufficient (possibly overly wordy at that) and regards the question of how to move, they are used to interfaces far worse than this---they will figure it out. I suppose that you could claim that as part of the puzzle :)