The Stroop effect is a psychological phenomenon whereby a person is liable to misread, or at least be slowed down in their reading, by a colour word written in a different hue. So BLUE and RED and GREEN will be misread, or at the very least cause confusion. You can read more about the Stroop Effect here . We thought it would be a useful tool to employ to give an expert card player an in-game handicap, without requiring any adjustment to the rules. Here are the four Aces: A