A place for chess activities, called "checkerboard." In the rectangular plane, painted nine parallel vertical lines and ten parallel horizontal line intersection, a total of ninety intersection points.
Pieces are placed on the intersection. The middle part, that is, the chessboard fifth and sixth horizontal lines between the vertical line is not drawn as "river boundary." In the middle of the chess board in China, there is often a gap in one area, which contains the words "Chu River" and "Hanjie". This is the "Chu-Han War" in the history of chess. According to historical records, the "Chuhe Hanjie" was built in the ancient Xingyang and Chenggao areas. It borders the Yellow River in the north, the Yingshan in the west, and the Songshan Mountain in the south. In 203 BC, Liu Bang dispatched troops to attack Chu and Xiang Yu was short of troops. He was forced to put forward the requirement of "dividing the world and cutting the valley to the west and to the east for Chu". Up to now, there are still two sites in the ancient Guangwu Mountain in Suiyang. The west side is called Hanwang City, and the east is called Wangcheng City. The legend is that Liu Bang and Xiang Yu built that year. In the middle of the two cities, there is a large ditch with a width of 300 meters, which is what people usually call the gulf and the basis of the bounding river on the chessboard.
The middle of the two ends, that is, the square between the fourth to the sixth vertical lines at both ends, diagonal crossed lines constitute the place of the "m" character called "Jiugong" (it happens to have nine intersections ), A symbol of the army account.
The entire board is divided into two equal parts by "river boundary." For the convenience of game recording and learning chess, the current rules stipulate that each vertical bar of a red square is represented by nine vertical bars from right to left, and each of the black bars is represented by an Arabic numeral of 1 to 9 line. One's own pawn always uses one's own line number, regardless of whether the piece crosses the river or not.
Before the game starts, both parties should place the pieces in the specified positions. Every step of any pawn, Jin write "into", retreat write "retreat", if the same as the car sideways, write "flat."