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 sophistica

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.