Computer-Generated Chess Problem 02551

What we have here is a 'KRRN vs kp' four-move chess problem generated autonomously by the prototype computer program, Chesthetica, using the relatively new computational creativity approach called the 'DSNS'. There is also no proven limit to the quantity or type of legal compositions that can be automatically generated.

8/8/K7/8/8/1NR5/1k5p/6R1 w - - 0 1
White to Play and Mate in 4
Chesthetica v11.02 (Selangor, Malaysia)
Generated on 11 Mar 2019 at 11:41:07 PMSolvability Estimate = Difficult
If you notice any version of Chesthetica 'skipped' from one problem to the next, that simply means additional (minor) changes were made to the program before it was set to run again. White has a decisive material advantage in this position but the winning sequence may not be immediately clear. If this one is too easy or too difficult for you, try out some of the others. Feel free to copy the position into a chess engine and discover even more variations of the solution.
Similar Chess Problems by Chesthetica: 00016 00476 01967
Main Line of the Solution (Skip to 0:35)