A bidirectional board game includes a playing board, and a plurality of playing pieces. The playing board has a matrix of squares defined by horizontal lines and vertical lines configured on a surface of the playing board. The squares are allocated in two regions identified for the two players, respectively. Each square allocated to both of the players includes a diagonal line. The playing pieces are divided into two distinguishable families each controlled by one of the two players. Each family includes a sovereign piece and a plurality of numeral pieces indicating a numeral 1 to 5. When playing the board game, the two players alternate moving the playing piece. The numeral indicated on the numeral piece is the maximum number of steps allowed to move in one action. Which hostile playing pieces can be captured by the numeral piece is determined by the numeral indicated thereon.