the 2022 World games and World Juniors would be 3 out of 5 games to 11, win by two. The IRF cited several factors for this change: length of matches, confusing scoring system to casual fans, and the need for faster matches to accommodate more matches. IRF's pivot to rally scoring had an immediate reaction in the NGBs, as most IRF qualifying events in USAR, Racquetball Canada, and other NGBs are now played under the IRF's rally scoring rules. Hinders Due to the nature of the game, players often occupy the space their opponent(s) want(s) to occupy. This may result in a player blocking his opponent's ability to play the ball. Such occurrences are termed either hinders or penalty hinders. A hinder is a replay of the current rally (the server resumes play at the first serve), while a penalty hinder results in the player who caused the avoidable obstruction to lose the rally. A type of hinder is a screen in which the player is unable to see the ball prior to it passing the opponent. The difference between a hinder and a penalty hinder (or formerly an avoidable hinder) is that in the latter case a player has missed out on a clear opportunity to make a rally-winning shot due to the obstruction by the player's opponent, while in the former case the opportunity missed would not clearly have led to a winning shot. This difference is almost always a judgment call by the referee (if available). There is also a "court" hinder in which some part of the playing field caused the ball to bounce untrue. Often this is the door frame or (recessed) handle or a flaw in the floor or walls. In this case, the rally is a re-serve. Game variations Racquetball games can be played with two, three or four players, with doubles or singles matches being most common. Two player games are called singles or "one-up" (one vs. one for the entire game), while four player games are doubles with two pairs playing against each other (two vs. two for the entire game). Tournament competitions have divisions for singles or doubles or both. Three-player games are most commonly called "Cut-throat" and sometimes "Ironman" (two-on-one for the entire game) where each player takes turns serving to the other two, who play as a team against the serving player. Another three-player game is "California", "In-and-Out",