There is a close relationship between Ba Gua and chessboard.
A queen can move 8 directions which is the same as the 8 trigrams on the Ba
Gua. The 64 squares of a chessboard are the same as the number of 64 hexagrams
of the Chinese I Ching.
Because of the close relationships between a Ba Gua and
chess, Ho Math and Chess has created a world first mathematics puzzle which
links Ba Gua, chess, and mathematics.