The white king controls all 3 squares that the black king can go to, to get off the back rank. So you know there is no need to move the king. So obviously it has to be a queen move. If black had 2 moves in a row, he could get off the back rank right? So...How do you stop black from getting off the back rank?
I just got to chapter 2 of the 5334 polgar book, which is 2 move mates and I am really struggling. Honestly, I kind of feel stupid because they seem like they should be so easy, but since the first move doesn't have to be check, I end up staring at the problems for so long and have a really hard time visualizing "well if this goes here, then the king only has this square... but If I go here, then it's stalemate, or if i go here then..." I think the problem is because the first move doesn't always have to be check, I have trouble figuring out where to look and why I should be looking there.
Here's an example from the book:
White to move (2 move mate)