I found TWO similar novel solutions to C11, where you blacken the entire 2nd row (the one with the king).
Not sure what the intended solution is, but the new C11 told me I had a novel solution: https://imgur.com/a/CXBqeyz
Not sure what the intended solution is, but the new C11 told me I had a novel solution: https://imgur.com/a/CXBqeyz