RGB (1999)

In RGB - a barbaric game played with Icehouse pieces on a chessboard - you're trying to kill your opponent's children. (You were warned it was barbaric!) You control an army of RGBs - alien creatures with three distinct layers of thought - and they lose one layer (and an ability) if they are attacked. For example, children must remain next to a piece which still has the green sustenance layer, or the child starves. Children can be created if the spare pieces exist, but only by one male and one female, both with the blue 'reproduction' layer. And attacks can only be carried out by pieces with the red destruction layer. RGB bears a few similarities to Chess, but not as many as you might think.