1.Nf4!d4
If 1... Kc2? 2.Nxd5
2.Bf6!
White must play force Black to play e2 - if 2.Kg6 d4 and Black draws: 3.Ng2! (or 3.Kf5 d3) 3... Kd1!! (Not 3... e2? 4.Ne1+ and wins, nor 3... Kd2 4.Kf5 d3 5.Ke4 Ke2 6.Nf4+, nor 3... Kc1 4.Ne1! Kd2 5.Kf5) 4.Kf5 d3! 5.Ke4 (5.Nxe3+ Ke2=) 5... d2 6.Kd3 Kc1!=
2...e2!
3.Nd3!
Not 3.Nxe2 d3=
3...Kc2
4.Ne1+Kd2
5.Bh4d3
6.Kg6Kc3
7.Bd8!Kd2
8.Ba5+Ke3
9.Kf5d2
10.Bb6#!
Cheron (1964) The composer claimed that this study was the ideal mate - no square is covered twice in the mating position; every piece has moved from its original square; and there have been no captures!