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.

According to such great attacking players as Bronstein and Tal, most combinations are inspired by the player's memories of earlier games.

Typically, in the last round of open tournaments the level of play is markedly lower, the number of blunders higher.

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.

Under no circumstances should you play fast if you have a winning position. Forget the clock, use all your time and make good moves.

Since your mental state can have such dramatic effects on your body, obviously your physical condition can affect your mental well-being. It follows that regular physical conditioning should be part of your overall chess training.

I had a slightly inferior endgame that probably should have been drawn, but Kortchnoi kept torturing me with little threats until finally, exhausted and exasperated, I made a losing mistake.