perhaps sweetening the stakes(ratings points) for games that people are reluctant to play certain sides. Many players will not play certain colors in certain games such as horde chess (black), phaTum(black), Maharajah Chess (white), these are a few examples. If there was a way to encourage players to play with these colors it might make for the games being played more often. the only way woudl seem to be offering more points for a win to play with those colors, or to give less points if you chose to play with the strong colors.