I am fortunate in knowing the theme well (it is the subject of a chapter in a book I wrote!) and so the two names and the characterisation in D made perfect sense to me. In what follows, I hope I am careful not to give anything away.
I was not very happy with the 'additional feature' which makes the impossible possible, but at a stretch it will do. In any case, there is no alternative if we are to retain real words.
I assume that we have to shade cells in three different colours, though that is not entirely clear in the rubric.
But how do I now indicate that the final solution is 'fit for a king or queen'? I can see it, but there is no more room for shading, so how can I prove I have seen it? I could, of course, make a comment below .... . This 'final step' does not add anything. Another hare, maybe?