Chess Puzzle of the Week (80): Solution

puzzle80

Last week I left you with this Mate in 2 composed by Norris Easter (2nd Prize, BCPS 001. Ty., 1926).

The solution, as discovered by Chris Baker, is 1. Ka8, unpinning the knight to threaten Nd7#. 1… Rxc5+ and Rxd6+ are both met by 2. Ne4#. 1… Kf6 is met by 2. Ne8# and 1… Nf6 runs into 2. Nc4#.