What we have here is a 'KRRBBN vs kqp' mate in 4 chess problem generated autonomously by the program, 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 (e.g. composing something original using only a rook vs. five pawns). Learn more about it on ChessBase. The largest endgame tablebase in existence today is for 7 pieces (Lomonosov) which contains over 500 trillion positions, most of which have not and never will be seen by human eyes. This problem with 9 pieces goes even beyond that and was therefore composed without any such help whatsoever.
White to Play and Mate in 4
Chesthetica v11.20 (Selangor, Malaysia)
Generated on 21 May 2019 at 2:14:18 PM
Most changes to Chesthetica that result in a slightly higher 'version number' are simply to improve the interface, by the way. White is over a rook's worth in material but the precise win in this position still needs to be found. Leave a comment below, if you like. Some of these problems may be trivial for you, especially if you're a club or master player but bear in mind that chess lovers can be found at all levels of play. So do check out some of the other problems. You can probably find something more to your taste.
Main Line of the Solution (Skip to 0:35)
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