Reading these 'advanced' books can screw up weaker players
who have been convinced and ill advised that there is more to chess
than what there actually is.
By coincidence I was talking to an OTB 1200 player today who played
in a recent under 1400 tournament.
I saw his game and in this position (he was White.)
He did not play 9.Nxe4 when he has Nxf7+ and if he wants Nxc6+?
"Why?" I asked.
These were his exact words.
"I've been reading my Nimzovitch and thought it was more important to double his pawns."
The game went 9.Bg5 Bd6 10.h3 h6 11.Bxf6+ gxf6
if anything I prefer Black. (the game was drawn).
Then he adds, "My allegro grade is 300 points better than my normal grade."
If he just played basic chess as he appears to be doing in his allegro games,
(and did not stop to think about these 'so called mysterious concepts.'
then he would score more wins.
The full game in question is here.
Look at Burns v Duff 2nd from the bottom.