The study sample consisted of 108 e-Sports players with an average age of 20 (SD = 3.27) and 54 casual players with an average age of 23 (SD = 5.44) playing two real-time strategy games. The e-Sports players consisted of 39 players of the game StarCraft: Broodwar and 69 players of the game WarCraft 3. Out of this, 44 players (solo players) preferred one-on-one games (1v1) and 64 players (team players) preferred playing with a team mate against the same number of opponents (2v2 etc.). In terms of the structure of the players, there were 21 clan leaders, 49 proper clan members and 38 who were not members of any clan. The players were of Slovak and Czech nationality as players from both countries play in common e-Sports leagues and tournaments. The players were asked to fill in a questionnaire directly on Battlenet or they were contacted via email. The questionnaires were administered online. Casual players were deemed as players who did not play any computer game professionally, played games for more than 2 h per week and did not play any MMORPG games. Casual players were recruited by non-randomized occasional sampling.