In chess the most unbelievable thing for me is that it's a game for everybody: rich, poor, girl, boy, old, young. It's a fantastic game which can unite people and generations! It's a language which you'll find people "speak" in every country. If you reach a certain level you find a very rich world! Art, sport, logic, psychology, a battlefield, imagination, creativity not only in practical games but don't forget either how amazing a feeling it is to compose a study, for example (unfortunately that's not appreciated these days but it's a fantastic part of chess!).
