
As a strategy board game played in China, chess is believed to have been derived from the Indian chaturanga. Chaturanga was transformed into the game xiangqi where the pieces are placed at the intersection of the lines of the board rather than within the squares. The object of the Chinese variation is similar to chaturanga, i.e. to render helpless the opponent's king, known as "general" on one side and "governor" on the other. Chinese chess also borrows elements from the game of Go, which was played in China since at least the 6th century BC. Owing to the influence of Go, Chinese chess is played on the intersections of the lines on the board, rather than in the squares. The game of Xianqi is also unique in that the middle rank represents a river, and is not divided into squares. Chinese chess pieces are usually flat and resemble those used in checkers, with pieces differentiated by writing their names on the flat surface