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Didn't see that Kg3 not possible because of Nf5. It's hard to imagine where the pieces are when they have been moved.

Yes, needs some practice ... :)

  1. b2 - b3, Kh4-g3
  2. N37-f5+ mate

That's the quickest way, it is possible because I'm playing both sides.



But why should black play Kh4-g3?!?!? :-)

Because he wants to lose the game the quickest way.