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check captcha is too hard for me...

...but its' cool

Sometimes it doesn't work.

Do the chess-captchas actually base on our games?

absolutely. This way we'll never run out of challenges. Every minute I pick the latest checkmate from lichess database to make the captcha.

creating those captchas for which the most sophisticated solving programs exist.

like a boss.

What if there are two possible moves for checkmate? Is it possible to pick the wrong one?

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