In the next position it is white to move, what should he play?
You can see the solution if you highlight the space between the brackets. (Whites strongest move is 1 c3 (1 Bd2 is an okay move and leads to an even position after 1 ... Bxa5 2 Bxa5) after which Black is forced to play 1 ...Bxa5 which gives white the possibility to play 2 Bg5! and white is better: e.g. 2 ... Nf6 3 exf6 gxf6 4 Ne5! 0-0 5 Bh6 fxe5 6 Qg4 Kf8 7 Qg7+ and white wins material.)
I missed this today when solving this position. What really bothered me that I hadn't seen the second move at all!! I really felt caught with my pants on my knees when I saw the solution, because suddenly I realised that I had not followed the single advice I give to almost all my students all the tiime: search for targets. Had I done this then I certainly would have spotted the immobilised and vulnerable position of the queen on d8.
This is a major problem for all us patzers. We think, calculate, judge, plan etc. But we forget to do the most important thing in chess, to look, to look closer!