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A case study where the client was a professional chess-player is presented. The objective of the intervention was to improve his chess performance. The chess-player attempts to control and avoid some private events and such a pattern of behaving causes a decrease in his performance. These attempts are functional equivalent and understandable from the experiential avoidance perspective. Consequently, a brief intervention of four sessions following ACT was implemented in two months. A significant improve of chess performance was achieved during follow-up according to the international ranking measure punctuation. Additionally, self-inform measures (Acceptance and Action Questionnaire and measures of interference, credibility and control of private events) decreased which might be coherent with the ACT process change. The actual state of Sports Psychology is discussed and the main features of ACT are presented.
