Yes, you read the title right; this problem is mate in 24!
As in all great problems, if you can get the first move, the rest is a walk in the park.
Ah. I didn't know. Thanks for telling me.
At move 12, can't black go Bg2?
I think not. White plays 13. Bb4 and whatever black does is followed by 14. b3#
Yes, you read the title right; this problem is mate in 24!