This book contains over 40 chess variants including rules and sample games. Most of the variants are historical or well known regional and modern variations. Some of the chess games included: Chatturanga, Shatranj/Medieval Chess, Oblong Chess, Byzantine (round board) Chess, Timur's (Tamerlane) Chess, Turkish Grand Chess, Courier Chess, Chinese Chess (Hsang Chi), Shogi, Tsiu Shogi, Double Chess, Martian Chess (Jetan), Capablanca's Chess, Nieuchess (the Avalon Hill game--which isn't very chess-like at all). According to some later writers the rules given for some variants have significant errors.