 The Circular Chess known as “al-Muddawara”, “ar Rumiya” or “the Byzantine chess” .One set of rules for medieval circular chess is from the Persian author Muhammad ibn Mahmud Amuli's 'Treasury of the Sciences' (1325).In this version, called "shatranj al-muddawara" (circular chess) or "shatranj ar-Rūmīya" (Roman or Byzantine chess), the game uses a board with four concentric rings, each split into 16 spaces.