Chess Puzzle of the Week (93): Solution

Last week I left you with this Mate in 4 composed by Fritz Giegold.

Giegold’s problems offer a very attrative introduction to the world of chess composition. If you see his name above the diagram you should always start by looking at the most improbable move.

This one solves by 1. Qg2! (threat Qxf3#) 1… fxg2 2. Rg3! (threat Rc3#) and, however Black captures, White has 3. Ng8 and 4. Ne7#.

Well done if you managed to solve this without computer assistance.