Thinking out of the box

In this game I missed the move 20...Qh7! (pointed out by Stockfish analysis). Interesting to see that such non routine moves are overlooked so easily by myself and possibly others. Here the check-and-capture rule (Which I never managed to implement properly) would not have helped. I guess I was too focused on the h1-h3 area.

Mmmm, very interesting. How to find this candidate move? Black has a huge attack here. Therefore attacking those points that are equally attacked and protected should be considered. d3 is attacked by the bishop and protected by the queen. So 20...Qh7 should be on the list.