Cool! wow!
3 Knights vs 1 Knight Real Endgame
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It would have been a bit trickier with Nc4 on c3 
Because they would get forked!
@3
No, that is not trickier: just 1 Nd5+ Kb7 2 f8=N.
The amazing thing is that KNNN can force checkmate against KN.
And what a about kd6 instead of b7 after nd5+?
Actually it is not amazing at all that NNN wins over N. As the tablebases confirm adding similar units on both sides of a drawn endgame often leads to a win. Whatever the precise reasoning behind it, this appears to be a common pattern!
KNNN also usually wins against KB!
@6 f8=Q+
Oh right nvm
https://www.chessgames.com/perl/chessgame?gid=2289013
An actual tournament game played in 1985 that ended up with a 3 Knights vs 1 knight endgame! The pawn has to promote to a knight because any other piece gets immediately forked and 2 Knights cannot force a checkmate. And any other move immediately loses the pawn resulting in the same draw. But a knight prevents the fork!