<human>:  What is the history behind the game of chess?
<bot>: The game of chess is believed to have originated in ancient India, sometime before the 7th century. Its roots trace back to a strategy game known as chaturanga, played on a board of sixty-four squares arranged in an 8x8 grid. The game was adopted by the Persian Empire and eventually spread to Europe through the Moorish conquest of Spain. By the 15th century, it had developed enough to be known as “chess,” or “shah” in Persian. The modern form of the game began to emerge in the 16th century, and it has been a popular board game ever since.