The objective of this research was the outcome of one-on-one battles between players in the defensive phase of the game. We conducted an indirect observation of 10 National Hockey League matches and 10 2018Winter Olympic Games matches, focusing on the frequency of successful one-on-one battles in the defensive phase of the game and how and in which zone they occurred. We recorded each successful one-on-one battle in the defensive phase of the game, in all three zones of the ice hockey rink. We assumed that there is a statistically significant relationship between the successful one-on-one battles in the defensive phase of the game and the final result of a nice hockey match. We used the Mann- Whitney U-Test to determine a relationship between success in one-on-one battles and the final result of a match and we used the significance test of two relative values to compare the acquired data. To find out the effect size, we calculated Cohen r. We determined the 5% statistical significance level in both statistical tests. The relationship between success at one-on-one battles in the defensive phase of the game and the final result a of match has proven to be statistically significant. We calculated the number of successful one-on-one battles according to methods of stealing the puck and the zones of the ice rink, and confirmed our hypotheses. In the matches of the National Hockey League we observed that there was a higher number of successful one-on-one battles than at the Winter Olympics Games in 2018.Using the information that we obtained, we concluded that it is possible to gain an advantage when creating a training programme by instructing players of each position what is required of them in one-on-one situations during matches, and increasing the amount of training in the one-on-one situation according to player position and zone.
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