Chess Captcha (always legal moves?)

I saw this on Twitter. Other games you would use for a captcha?

Graham Cluley says chess captchas aren’t hard to defeat in: Chess CAPTCHA – a serious defence against spammers?

But Cluley, like most users, is assuming a chess captcha has a chess legal solution.

What if the solution is an illegal move? Or more than one illegal move?

An illegal move would put the captcha beyond any standard chess program.

Yes?

Reserving access to those told of the solution.

Comments are closed.