with 20...h5 Black started an interesting counter-attack and with 26...Re3 he obtained the advantage.Reading this, the first thing that occurred to my perhaps over-pedantic mind was: how could Black have obtained the advantage? If after his 26th move he had the advantage, surely he had it before his 26th move as well? Isn't the nature of an advantage that it is inherent in a position? That provided moves are available to you which subsequent to their execution will give you a better position than your opponent, you already possess the advantage?
This being so, surely an advantage can only be provided by an opponent's error rather than by our moves as such, however good they may be? Provided we neglect the question of whether there is an advantage to either side in the opening position, which is in any case irrelevant to Eingorn's point (or Alekhine's, as paraphrased by Eingorn) I'd suggest that it is. Black must already have possessed the advantage before he moved. You cannot create your own advantage.