For centures people have been playing games.
Chess is one of the oldest games known today.
Originaly it was invented in India. As time moved on, chess started to spread all over the world. People changed chess, and the ways they play this game. Chess as a game has almost the same rules for these different ways to play, but each way is different sociologically. Sometimes this is possible to messure an opponent before a game by looking at him and decide what style to play agains him depending on if he looks dangerous or not.