Players can also use this information to predict the cards their opponents will need to finish their sets and runs, which will help them modify their strategy. Acquiring an Edge inrummy tricks the Market. Player advantage in the game can be substantial if one learns to count cards. Players can obtain information about their opponents' hand & attempt to prevent them from obtaining the cards they require by closely observing the cards that are being picked up & discarded. They can concentrate on finishing their own sets and runs at the same time.