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The chessboard is one of the three elements of chess (chessboard, pieces, and rules), and is a necessary guarantee for a chess game. The types of chessboards are mainly divided into intersection-type chess positions (such as Chinese chess, Go, Gobang), square-style chess positions (such as international chess, Othello) and line-segment chess positions (rare). Also known as "chess board" and "game board". There are grids and other markings on the plate, which is used for placing the pieces when playing chess. It is mostly made of wood or paper. Tang Wei Yingwu's poem "Twenty-two Books of False Lu": "The chessboard in the flower is detested by birds, and the scroll beside the pillow is amazed. The wind is open." Song Mifu's "History of Painting: Tang Paintings": "Zhang Youzhi ... can also use seal strokes to draw chessboards, and the brush strokes are similar." Ru Zhijuan's "Tall Poplar Trees By the Chenghe River": " They tied the poles into two chessboard-shaped hollow rafts, and two fellow villagers each carried one to the water's edge." The chessboard is a square-shaped chessboard. There are 8*8=64 chess positions on the board, 32 squares are black, 32 squares are white, and the lower right corner of the chessboard is always white. The Go board consists of 19 horizontal lines and 19 vertical lines, with a total of 361 intersections. The outermost line is called the side line. In order to facilitate the identification of the position of the pieces, nine points are drawn on the chessboard, which are called "stars" in terms, and the central star point is also called "Tianyuan". The chessboard can be divided into "corners", "sides" and "middle belly". Today's chessboards are 19×19, 13×13, 9×9, which are more common, and some are rarer 15×15, 17×17. The chessboard used in the official game is 19×3365, and the others are used as teaching and practice aids.