Mate in four

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Crazychessplaya

White to play and mate in four moves:

Moonspell_RO

Nba6. Simple :)

Crazychessplaya

Correct!

zankfrappa

Kc8.

Crazychessplaya

After 1.Kc8, black extends the game a little by ...a5 or ...a6, and it is no longer a mate in 4.