As a rule, so-called "positional" sacrifices are considered more difficult, and therefore more praise-worthy, than those which are based exclusively on an exact calculation of tactical possibilities.

Chess is not only knowledge and logic

Deux fous gagnent toujours, mais trois fous, non!

Play on both sides of the board is my favourite strategy.

Playing for complications is an extreme measure that a player should adopt only when he cannot find a clear and logical plan.

A lifetime in not enough to learn everything about chess.