3 Knights

White to play and mate in 4 moves without moving any piece twice .

nice

Of course not because any player will promote the pawn to queen , but if a player is sure that he can win with 3 knights then why not ?

Any way the puzzle is only for fun !

u r right KOJER

very nice ....

There's at least one other solution:

1. Kf7 Kh7 2. Nf5 Kh8 3. Ng6+ Kh7 4. Ng5#

Yes caveatcanis , there are more than one solution .

AIUI there has been at least one master-level game that finished K+3N v K+N, presumably because White had to promote the pawn or lose it, and would have suffered a fork if he promoted to Queen. And since K+2N can't force mate, it's possibly useful to look at K+3N, though I don't know OTTOMH how that compares in difficulty with K+B+N. 

Cool

done it in 4 attempts