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http://en.lichess.org/captcha/0nbdeigw?solution=a1+a2 returns either 1 or 0.
The total complexity of this to brute force is 768 possible moves.
Most of us here could write a bot to spam their site with less than 30 minutes of time and effort.
Earlier quoted context omitted.
It also keeps out beginners. Depending on the forum (I'm not familiar with lichess) that might be a drawback or a bonus.
The captcha seems very easy (I am not a chess player)- I tried three times and always got a board to solve in one move, so I doubt anyone that knows the rules of chess is going to be excluded. That's probably not a problem for this forum :)
So if someone doesn't know Chess, it's not a human.
What's with the "Ping" at the bottom of the page. Why would someone do that?
A quick google gives this; apparently from the creator. "I[t] tells how fast your computer talks with lichess server. It measures the time a message needs to make the round trip from your browser to lichess, then from lichess to your browser. I'm interrested in knowing what your ping is, depending on the country/city where you live. I live in Le Mans, France, and my ping is around 30-40ms. What about you?" {source} h…
edit: I wanted to comment on the parent comment. Sorry.
Can brute force answer from the server quicky: http://en.lichess.org/captcha/0nbdeigw?solution=a1+a2 returns either 1 or 0. The total complexity of this to brute force is 768 possible moves. Most of us here could write a bot to spam their site with less than 30 minutes of time and effort.
Earlier quoted context omitted.
It also keeps out beginners. Depending on the forum (I'm not familiar with lichess) that might be a drawback or a bonus.
The captcha seems very easy (I am not a chess player)- I tried three times and always got a board to solve in one move, so I doubt anyone that knows the rules of chess is going to be excluded. That's probably not a problem for this forum :)
(I enjoy this mini chess, it's like a low tech version of Bejeweled. I don't have the patience for full fledged chess games, but just finding the last move is fun.)
Can brute force answer from the server quicky: http://en.lichess.org/captcha/0nbdeigw?solution=a1+a2 returns either 1 or 0. The total complexity of this to brute force is 768 possible moves. Most of us here could write a bot to spam their site with less than 30 minutes of time and effort.
Cracking this captcha won't give you access to any significant audience.
Can brute force answer from the server quicky: http://en.lichess.org/captcha/0nbdeigw?solution=a1+a2 returns either 1 or 0. The total complexity of this to brute force is 768 possible moves. Most of us here could write a bot to spam their site with less than 30 minutes of time and effort.