Computer-Generated Chess Problem 03234

An original 'KRN vs kbn' four-move chess puzzle or problem (whichever you wish to call it) composed by a computer using the Digital Synaptic Neural Substrate (DSNS) computational creativity approach. The DSNS does not use endgame tablebases, neural networks or any kind of machine learning found in traditional artificial intelligence (AI). It also has nothing to do with deep learning.

8/8/3R4/8/6K1/5n2/7N/1b5k w - - 0 1
White to Play and Mate in 4
Chesthetica v12.28 (Selangor, Malaysia)
Generated on 7 Mar 2021 at 11:31:31 AMSolvability Estimate = Difficult
If you notice an earlier version of Chesthetica listed with a newer problem, that simply means an earlier version may have been running on a different computer or OS user account. White has a slight material advantage over Black. Try to solve this as quickly as you can. If you like it, please share with others. Solving chess puzzles like this can be good for your health as it keeps your brain active. It may even delay or prevent dementia.
Similar Chess Problems by Chesthetica: 00060, 00647, 01565.
Solution