There are more possible iterations of a game of chess than atoms in the universe.
Why it is true
After just 4 moves by each player, there are 288 billion different possible positions on the board.
Source: Mathematics
Would you rather be asked first?
This is the reading side of the site, so the answer is in the sentence above — that is the whole point of it. Test yourself works the other way round: the question comes on its own, and the fact and the explanation only appear once you have answered.