Often you will find the opposite situation. The author seems to have interesting ideas, but he is not able to illustrate them with decent examples. If a grandmaster is commenting on one of his own games, then there is usually not any problem: his general thoughts are closely tied up with what is happening on the board. But as soon as he starts writing an article or book on a different theme the difficulties begin, as he may not have suitable material to hand.

It is not possible to become a great player without having learned how to analyse deeply and accurately.

Black is now in desperate need of a good idea. Or, to put it standard chess notation, +-

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.

In 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.

It is hardly useful if you trustingly play through variation after variation from a book. It is a great deal more useful and more interesting if you take part actively in the analysis, find something yourself, and try to refute some of the author's conclusions.

I feel that it is no less interesting to be a trainer than to play oneself. I even take greater delight in the tournament successes of my lads than I do in my own.