It's a board game for two players, and can be played against another person, the computer, or all by itself. The board consists of two rows of two 'pits'. There are two players, north and south . Each player controls the two pits on his side. In the initial position each pit contains two beads.
Any player starts.
On his turn a player selects one of his own pits, takes out all beads, and distributes them one by one in a counter-clockwise direction over the other three pits. If a player on his turn finds both his pits empty, he has lost. You can download two different freeware Java versions of this program to play offline.