Here it is: lichess.org/training/tk65c
(EDIT: After 55. f6 Bc3) instead of the given solution 56. f7, 56. Kf5 also seems to work (which I played). Engine thinks it is a draw first, but after playing a few moves the eval goes up (a bunch of only-moves apparently). For example 56...Kxh3 57.Kg6 Be5 58.f7 Bd6 59.Kxh6 Kg4 60.Kg7 wins according to the browser engine. I don't have the apparently required computing power at my disposal, so it'd be great if someone could check if Kf5 is indeed winning. In any case, to calculate all that is quite inhuman. Also there should be a button to report a bad puzzle, even though it is the first faulty one I encountered on here!
(EDIT: After 55. f6 Bc3) instead of the given solution 56. f7, 56. Kf5 also seems to work (which I played). Engine thinks it is a draw first, but after playing a few moves the eval goes up (a bunch of only-moves apparently). For example 56...Kxh3 57.Kg6 Be5 58.f7 Bd6 59.Kxh6 Kg4 60.Kg7 wins according to the browser engine. I don't have the apparently required computing power at my disposal, so it'd be great if someone could check if Kf5 is indeed winning. In any case, to calculate all that is quite inhuman. Also there should be a button to report a bad puzzle, even though it is the first faulty one I encountered on here!