This puzzle is part of the Fortnightly Topic Challenge - "Unconventional Tag Fusion".
Last week I found out that Puzzle Prime Co. have invented new type of puzzle - Rubik's Chess. The goal is simple - you get a scrambled cube with various chess pieces on its sides, and you must unscramble it so that on each side there is one mated king (K), assuming the kings can not capture the neighboring pieces (Queens, Rooks, Bishops, kNights). Puzzle Prime was offering cubes of varying difficulties, ranging from A-rank, all the way to Z-rank. I decided to go with something medium, so purchased a "P" and received it few days later in my mailbox.
I am usually good with this type of puzzles, but I spent my entire weekend trying to solve this one without any success. I even started wondering if it can be actually solved, so decided to share it with you and see if someone can help me figure that out.
I couldn't create a proper 3D model of the puzzle, but fortunately @Sleafar managed to draw a wonderful diagram showing all faces of the cube when seen from the top and the bottom:
Remark: The orientations of the pieces are irrelevant of the final solution, i.e. they don't need to be consistent on each side.