Tomson, J. B. The Problemist, March 1981
Mate in 3

1. Kf2

Threat Ng3+.

1... Ne5

1... e5 2. Ng3+ ;

1... Nf5 2. Ne6+ ;

1... Nc5 2. Bd5+ ;

1... Nf6 2. Nf3+ .

2. Ng3+

1-0