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> it takes more time than a normal CAPTCHA

Most of these captchas are very easy. If the targeted king was easier to spot (e.g. marked red) I'm sure I would solve them faster than the omnipresent reCaptchas (even knowing that I only need to type the less legible word).

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Yes but for some people that don't know how to play chess it would be very hard.

I'd hazard a guess that most people posting on a chess forum know the rules.

And as somebody else pointed out, maybe they don't want new topics asking what are the possible moves of a queen.

>for some people that don't know how to play chess it would be harder Opps.. I didn't realize.

It is on a chess forum.

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