Computer-Generated Chess Problem 02746

Take a look at this 'KQRBP vs krpp' mate in 4 chess construct composed autonomously by Chesthetica using the relatively new computational creativity approach called the 'DSNS'. Chesthetica is able to generate various types of mates and study-like constructs and also compose problems using specific combinations of pieces fed into it (such as using only a queen vs. rook and knight). Learn more about it on ChessBase. The position below contains 9 pieces which means it simply could not have been derived even from an existing endgame tablebase which is presently limited to 7 pieces.

8/8/Rp6/1kp2Q2/1P2K3/2r5/2B5/8 w - - 0 1
White to Play and Mate in 4
Chesthetica v11.32 (Selangor, Malaysia)
Generated on 11 Sep 2019 at 2:59:15 AMSolvability Estimate = Moderate
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 decisive material advantage in this position but the winning sequence may not be immediately clear. Leave a comment below, if you like. Collectively, these puzzles are intended to cater to players of all levels.
Solution