Bao is a game for two players. In the original version you can also play alone against the computer. The playing field (a thick wooden board) consists of four rows of eight squares each (small depressions) in which the game pieces are placed. The top two rows belong to one player, the bottom two to the other, and each board starts with two pieces. The aim of the game is either to make the opponent unable to move or to empty the upper row of the opponent (in the case of the upper player this is the second row from above, because the opponent is sitting opposite).