lichess.org/training/31299
first move Kf5 or Kg5 with mate in 3 considered correct,
but first move Kg6 or Rf8+, which also leads to mate in 3 - considered wrong
first move Kf5 or Kg5 with mate in 3 considered correct,
but first move Kg6 or Rf8+, which also leads to mate in 3 - considered wrong