Each player gets six white and six black chips and places them in a row before him or her. The players then take turns playing cards which show changes. For instance, one can change a white chip against a white and two black chips which have to be placed in a specific pattern, though. The first player to get all chips in his/her row changed to his/her color is the winner. There are variants for three or four players. The cards are open, so one has to pay attention to what the other player might need. - BoardGameGeek