The world's major chess forms, their history and evolution. A fundamental introduction to chess as a world cultural advent. Includes  chess, shatranj, chatrang, chaturanga, chaturaji, courier chess, shogi, xiangqi, janggi, makruk, shatar, sittuyin, the Charlemagne and Da Vinci sets, and variants Loka and dou shou qi. Rick Knowlton of AncientChess.com