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6.Xac center of the box:
the chessboard has 4 center box in the middle, which is the umbrella d4, e4, e5 and d5.
The center box is very important because when cells occupy this flag, military flags can control across the board. 7.Duong cross on a chessboard King: in addition, there are other chess table diagonally, including cells of the same color connect corner flag together. I called the name of each diagonal by pairing the top of chess and chess end. For example, a1-h8 diagonal, diagonal e1-h4, a5-d8 diagonal ...
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