Continuing with famous classic problems, this is problem 15 from Chō’s tsumego encyclopedia, advanced section.
Black to play.
All times are in Helsinki time (eet with summer time).
Check the current review credits balance
Public lectures on Twitch every 2nd and 4th Saturday of the month at 1 pm.
Jeff and Mikko stream on Twitch on Fridays at 6 pm.
Solution added. Sorry for the delay!