Ambush, (also known as Rithmomachia) is an ancient board game based the Mathematics of Pythagoras. It was once as popular as chess but is little known today.
The object is to be the first to reach over a certain number of points, (total value of opponents captured pieces), or to capture a certain number of pieces.
The pieces may move in a straight line in any direction. You cannot jump a piece. The round pieces move one square at a time, triangles three and the squares four. The pyramid is really a stack made up of other pieces and can move like any of its component pieces. Just click the left mouse button on a pyramid to cycle through its' components.