Errors have nothing to do with luck; they are caused by time pressure, discomfort or unfamiliarilty with a position, distractions, feelings of intimidation, nervous tension, overambition, excessive caution, and dozens of other psychological factors.
Pal BenkoTypically, in the last round of open tournaments the level of play is markedly lower, the number of blunders higher.
Pal BenkoAccording to such great attacking players as Bronstein and Tal, most combinations are inspired by the player's memories of earlier games.
Pal Benko