Knight to f3 is NOT mate for black because white can play Bg2.
FLAWED DAILY PUZZLES
I think black wins after knight to H4 White has no counter play and black after taking White's b-pawn has two active rooks.. The White Queen is the only piece left to come to the rescue.



I posted to your daily puzzle page today, Jan 12, regarding the "Flaw in Todays Daily Puzzle" It turns out that Black actually wins if you play your "solution move". Knight to F3 creates a mating net for Black. Read my post under JGRAHAM # 57 I think.
I have found several such flawed daily puzzle problems just over the last few months. You should be more careful in choosing them.
After Qf8+ or Rxh4+ black is lost
I posted to your daily puzzle page today, Jan 12, regarding the "Flaw in Todays Daily Puzzle" It turns out that Black actually wins if you play your "solution move". Knight to F3 creates a mating net for Black. Read my post under JGRAHAM # 57 I think.
I have found several such flawed daily puzzle problems just over the last few months. You should be more careful in choosing them.