In chess, there is only one mistake: over-estimation of your opponent. All else is either bad luck or weakness.
Savielly TartakowerShall we ever live to see the following wise prohibition - the audience is forbidden to smoke and the masters are forbidden to 'smoke out' the audience by playing exchanging variations?
Savielly TartakowerLasker thought that his rationalism rendered him immune from the surprises of chess theory.
Savielly Tartakower