One vital part to be a strong chess player are psychological preparation for chess. Stay focus and calm no matter what is going on around you or on the board will help you are lot. Martin Hagger is Professor of Psychology at Curtin University and is excellent in exercise psychology. Here he shows how the techniques might be used by competitive athletes and coaches to maximise performance. But all chess player can use a lot of things from his ideas too. If you want ideas from him you can have a look at this.