U.S. Open
The U.S. Open is a six-round
Swiss-McMahon Go tournament with the longest time limits of any North American tournament. The Open is the largest Go tournament in North America. In 2006 and 2007, the tournament's top prize was $2,000. Players are grouped by
strength into different sections. These range from beginners (33kyu - 30kyu) to the advanced open section (7 dan and above). Until 2014, High dan players (4 dan and above) received a base time of 120 minutes with 5 - 30 second
byo-yomi periods. All other players received a base time of 90 minutes with 5 - 30 second byo-yomi periods. From 2014 thru 2024, all players in the U.S. Open received the same time of 90 minutes base time with 5 - 30 second byo-yomi periods. Starting in 2025, the AGA switched from byo-yomi to bonus time (also known as Fisher time). The 2025 setting for the U. S. Open (including the Masters) is 60 minutes basic time and 20 seconds increment. Additionally, beginning in 2014, the open section of the U.S. Open (7 dan and above) was combined with the North American Ing Masters into a 9-round tournament with a top prize of $5,000. Players who were not 7 dan but had accumulated a sufficient number of qualifier points were also eligible to play in this section. Players who were 7 dan or above who did not wish to play in the North American Masters Tournament were allowed to play in the top section of the U.S. Open, which now combined 6 dan and 7 dan players, albeit with a lower amount of prize money at stake. == North American Ing Masters ==