One often reads in Chess books the phrase "not in the spirit of the position".
I came to the realisation the meaning of this phrase in a game where I was on the Black side of a Sicilian Sveshnikov.
It is paramount White doesn't allow Black to obtain a free hand in the centre and steam roll him. He needs counterplay.
White to Play: Fight back!
My opponent played very meekly with 15. f3. This is not in the spirit of the position, as White does not have the liberty to play passively.
Instead, White must strike at b5 with 15. a4 and maintain tension. This is thematic in such positions.
Just 3 moves later, and Black obtained the following position as he takes over the game.
My Game Annotations and Analysis