can anyone explain this solution to me in more detail?

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Avatar of jameswaters1993
in the mammoth book of chess by graham burgess there is a 25 trickier mates in two section. No.20 doesnt make any sense to me.
Avatar of macer75
jameswaters1993 wrote:
in the mammoth book of chess by graham burgess there is a 25 trickier mates in two section. No.20 doesnt make any sense to me.

I don't get it either. #17 also seems like a tough one.