Composed by Andre Charon in 1964 and reprinted in Maxims of Chess by John W. Collins.  I'm sure some of you have seen it before, but I'd thought I'd share...

 

is that possible.

No it's not possible in a real game, it's just an endgame study.  I'm not sure how much practical value this puzzle has, it's mostly just a bit of fun, although it reminds me how devestating knights can be under the right set of circumstances.

I think it's a quicker mate if white started with 1. d8=N

Sunshiny wrote: I think it's a quicker mate if white started with 1. d8=N

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d8=N leads to 1...Kd7+ and black can force mate in two.  If white plays 2. Ne6, then black can reply 2...f1=Q  3.Kxa5 Qb5 mates. 

 

2.Nb6+ leads to Rxb6 and mate.

 

Is there another variation I'm overlooking?  Did you have a continuation?

1. d8=N+ Kd7

2. c8=Q+  Kd6

3. e8=N+ Ke7

4. f8=Q# 

Doesn't work.  Kd7+ puts the white king in discovered check by the rook on g6.  White has to force check on every move and keep the king on the sixth rank.

Oh, i didn't see the check from the rook. Okay, that changes everything then!

No sweat... I had to check it out myself to make sure it was all good.