Computer-Generated Chess Problem 03429

An original 'KQB vs krrn' mate in 4 chess problem generated by Chesthetica using the fairly new computational creativity approach called the 'DSNS'. Chesthetica is able to generate three-movers, four-moves, five-movers and study-like constructs and also compose problems using specific pieces types fed into it (such as using only a queen vs. rook and knight). Read more about it on ChessBase.

4nK1k/8/7r/7Q/7r/8/3B4/8 w - - 0 1
White to Play and Mate in 4
Chesthetica v12.38 (Selangor, Malaysia)
Generated on 22 Aug 2021 at 7:33:03 AMSolvability Estimate = Difficult
Most changes to Chesthetica that result in a slightly higher version number are simply to improve the interface or fix a minor bug, by the way. Chesthetica composes only unique or new constructs. If you have seen it before, cite the source and comment below because it is purely coincidental. Try to solve this as quickly as you can. If you like it, please share with others. Take some time to study the analysis and you might appreciate the puzzle a little more.
A Similar Chess Problem by Chesthetica: 00114
Solution