It is rightly said that the most difficult thing in chess is winning a won position

Computers have changed the world of chess.

Look at the catastrophic record Vishy Anand has against Garry Kasparov. Kasparov managed to beat him almost everywhere they played, even though Vishy Anand has belonged to the absolute top players in the world for fifteen years. This difference cannot be explained purely in chess terms, there must have been some psychology.

In games against humans, you often win because the opponent blunders a piece, and you can often survive when you do it yourself. Against the computer, you make only one mistake - the last one.

Even if you play perfectly, a fault of your opponent's can destroy the entire beauty of the game.

My very first book was a games collection of Anatoly Karpov. On the whole I was attracted by positonal play with some tactics, and already then I was aiming for universality.

In chess one cannot control everything. Sometimes a game takes an unexpected turn, in which beauty begins to emerge. Both players are always instrumental in this.