Computer-Generated Chess Problem 03351

Now, here we have a 'KQBN vs kb' mate in 4 chess puzzle created by a computer program, Chesthetica, using the approach known as the DSNS from the sub-field of AI, computational creativity. Depending on the type and complexity of the problem desired, a single instance of Chesthetica running on a desktop computer can probably generate anywhere between one and ten problems per hour.

8/2b5/K1kN4/8/6Q1/8/8/4B3 w - - 0 1
White to Play and Mate in 4
Chesthetica v12.30 (Selangor, Malaysia)
Generated on 11 Jun 2021 at 6:07:48 PMSolvability Estimate = Difficult
Humans have been composing original chess problems for over a thousand years. Now a computer can do it too. White is ahead by a knight and a queen. Why not time yourself how long it took you to solve this? Collectively, these puzzles are intended to cater to players of all levels.
Similar Chess Problems by Chesthetica: 00226, 00430, 00432, 02073.
Solution