The main point of the text is to give a brief explanation of the origin and purpose of the game of chess.
The main point of a text is the main theme of the text. Generally the main point should be identified as the general theme that encompasses all the information in the text.
According to the above, it can be inferred that the main point of the text is a brief explanation of the objective of the game of chess and an approximation of when and where it originated.
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