How did chess become a game played worldwide?

Imagine a game invented over a thousand years ago that somehow ended up in classrooms, coffee shops, and smartphones all over the world. A game where a wooden horse can topple a kingdom. That's chess — and its journey from one dusty corner of ancient India to everywhere is a story of travelers, traders, and people who just couldn't stop playing.
Around 600 CE, in northern India, someone invented a game called chaturanga. It was a battle on a board: elephants, chariots, cavalry, and foot soldiers protecting their king. The rules were new, but the idea caught fire. Within decades, Persian traders learned it, loved it, and carried it west along the Silk Road — tucked in their saddlebags alongside spices and silk.
