Try this mate in five!

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Avatar of TalFan

 

Took me a while, but it should all work fine :)

Avatar of rooperi

pretty neat...

Avatar of eaglex

you can mate with the two knights too

Avatar of videogamefan

no, then the pawn would queen. also, what about 4. gxf3 gxf3 5. Bxf3# ? and, the king could move anywhere