5.03 Equal Skill is a standardized method of evaluating the relative skill level of players in online gaming. It involves assigning each player a numerical value, known as a skill rating, based on their performance in a given game. This rating is then used to match players of similar skill levels in online tournaments and matches. There are two main types of 5.03 Equal Skill: the ELO and TrueS kill systems. The ELO system is based on a system developed by Ar pad ELO, while the TrueS kill system is developed by Microsoft Research. Both systems are designed to evaluate a player's skill level based on their performance in games, and are used in many popular online games, such as Counter-Strike, League of Legends, and Star Craft II.