Professionals are strategists who place a high value on the exactness of their game and rarely let their emotions get out of hand. Professionals like to keep things under control - they don't like to take undue risks, either by attacking the opponent or allowing themselves to be attacked. Instead, Professionals like to exploit long-term weaknesses. While they deal with long-term strategic and positional factors, they don’t rely on vague, intuitive judgments - for the Professional, chess is an exact, calculated science.