Chess Puzzle of the Week (113): Solution

Last week’s Mate in 4 (Hans Suhr Magasinet 1944), taken from Cyrus Lakdawala’s new book Rewire your Chess Brain, solves like this:

1. Kb3! Kb6 2. Qd7! Ka6 3. Qc7! Kb5 4. Qb7#

Well done if you managed to solve this!