Today's CAPTCHA Is Not Entirely Correct

https://i.imgur.com/sm6En6w.png

My move, rook to that corner, should be checkmate, since all squares are covered. The only reason it isn't is because Sente has a bishop in hand which I can't see.

I say “today's” because the CAPTCHA seems to refresh on a regular interval instead of every page reload, which is also probably a bug.

You can't post in the forums yet. Play some games!