Emotional instability can be one of the factors giving rise to a failure by chess players in important duels. Under the influence of surging emotions (and not necessarily negative ones) we sometimes lose concentration and stop objectively evaluating the events that are taking place on the board.
Mark DvoretskyIn positions of strategic manoeuvring (where time is not of decisive importance) seek the worst-placed piece. Activating that piece is often the most reliable way of improving your position as a whole.
Mark DvoretskyAs a rule, pawn endings have a forced character, and they can be worked out conclusively.
Mark DvoretskyTraining in analysis (like any other form of chess training) should be treated very seriously.
Mark Dvoretsky