Many excellent problems. Congrats to the winners especially Ilija Serafimović who dominated with top two prizes and another! However I did not understand the judges comments about pure line openings.
For instance in the 2nd Hon. Mention, in Karthikeyan's setting the white bishop guards g6 after opening black queen line. Criticising this as not pure, the judge suggests another (heavier) setting where after line opening, the white bishop closes a black rook enabling the mate. I dont see how the second setting is PURE line opening while the author's setting is not.