The evolution of chaturanga into Shatranj, a two-player game popular in northern India, Pakistan, Afghanistan, and parts of Central Asia after 600 CE, added a new piece called firzān. This counsellor, unrelated to troop formations, brought fresh dynamics to the game. Shatranj spread eastward, with chess-like games reaching China by 750 CE and later finding their way to Japan and Korea.
As the game travelled west, it underwent transformations on its journey to Europe. Persian, Byzantine, and Arabian influences played pivotal roles. Chess found its way into Europe through various channels, including the expanding Arabian empire, introducing a new era of strategic gaming.
Muslims brought chess to North Africa, Sicily, and Spain by the 10th century, and Eastern Slavs spread it to Kievan Rus. Vikings carried the game to Iceland and England, are to be believed responsible for the most famous collection of chessmen that were found on the Isle of Lewis, discovered in the Outer Hebrides and dating back to the 11th or 12th century.