When you play against an experienced opponent who exploits all the defensive resources at his command you sometimes have to walk time and again, along the narrow path of 'the only move'.
David BronsteinThere is no disputing that in the eyes of Schlechter, Teichmann or even Rubinstein, the backward pawn was something more substantial than lively piece play, but in our day the latter is more often preferred.
David Bronstein