Chess is a board game for two players.
It has been described as a synthesis between art, science and competitive endeavour, and is widely seen as a metaphor (however vague) for life in general or at least a philosophical interpretation or outlook on life. As with all games and sports, chess is about defeating a foe in a battle of skill and ability, but the struggle in chess involves deep analytical and intuitive subtlety due to its inherent appearance of simplicity but actual complexity.
The "game" is deceptively simple, with its relatively few rules, all of which are easily understood by people of all abilities. However, in chess there are twenty possible starting moves for White (who always plays first) followed by a further twenty for Black (each army starts as a mirror of the other), making 400 different positions on the first move alone. In each of these 400 scenarios, White would probably have a further, for example, 20 or 25 moves, taking the possibilities to at least 8000, then 150,000, 3,000,000 and so on.
It has been proven mathematically that there are more possible ways for a game of chess to unfold than there are atoms in the Universe, though this depends on estimates of how many atoms there are in the universe and the assumption that this number is finite.