significant rule changes were made in the AUDL pro league games. Most differences are minor and they can be found online. USAU rules have been slowly shifting toward WFDF compatibility. AUDL rule changes American Ultimate Disc League (AUDL), the semi-professional ultimate league with teams in the U.S. and Canada, has its own variant of the rules, and has made multiple rule changes in recent years. Some of the more important include: Slightly larger field dimensions. Shorter, 20-yard end zones. In WFDF, games are played to points with two halves and global time caps. In the AUDL, the game is played in four quarters of 12:00 minutes each. The counted times is only when the disc is in actual play, resulting in games lasting over two hours at times. The game stops on the timed second, rather than at the end of the point. At this point the disc is still allowed to be caught, which can result in "buzzer beater" or "in-bound Greatest" attempts, where players attempt to throw the disc right before the time ends. Referees making calls instead of players. Players may invoke the "integrity rule" and overrule the referees' call when the players call is against their own team. Most fouls are penalized with a 10- or 20-yard move of position against the fouling team. Double-teaming is allowed, but not triple-teaming. Stall count is 7 seconds instead of 10 seconds. Stall count is counted by the referees rather than the marking player. Throwing and catching techniques A player may catch the disc with one or two hands. A catch can grab the rim with one or two hands, or simultaneously grab the top and bottom of the frisbee – in a clap-catch / "pancake catch". Care is needed with the hand placement when catching with one hand on the disc rim, making sure to catch on the proper side of the disc, according to which way the disc is spinning. When a frisbee is thrown at high speeds, as is frequently the case in a competitive game of ultimate, one side of the disc can spin out of the player's hand, and the other side can spin into their hand, which can make a catch far more secure. For this reason, along with the desire to secure the frisbee strongly and "cleanly", the general advice is to strongly prefer to catch with two hands if possible. The