| 摘要 |
A numeral chessboard which has MxN positions is divided into four centre-symmetric regions. The four regions are indicated by four marks in the direction of clockwise or counter clockwise. Each of positions in four regions is marked by the number of a horizontal line and the number of a vertical line. Frames surrounding chessboard each of which is correspondent with each side of the chessboard are provided. The record of chess manual, when using this chessboard, can ensure that the positions and sequence of chessman are accurate during the transfer of information of chess manual. |
