Invitational version format

In the invitational, non-ranking version, 25 players take part, although players often withdraw and are replaced by others. There is no audience. Players earn money for every frame won and there are also prizes for being a semi-finalist, runner-up and winner of each group, with more money involved in the winners' group. In the first two years all matches in the group stages were the best of four, meaning that the matches could end in a draw as all the four frames were played, and the semi-finals and final were best of five. Since 2010 all matches are best of five. The competition runs over eight groups, each consisting of seven players. From the league stage of the first seven groups the top four qualify for a play-off, the winner of which qualifies for the winners' group. The bottom two players of each league are eliminated and the remaining four move to the next group, where they are joined by three more players until the seventh group. In each group, the players are ranked by the number of matches won, then by most frames won, and then by least frames lost. If two players are tied by these criteria, the player who won the match between them is ranked higher in the table. The winners play in the final group with the champion taking a place in that year's Premier League Snooker until 2012,^[3] and in that year's Champion of Champions from 2013.

Ranking version format

In the ranking version, 128 players take part in 32 rounds of group matches with each group consisting of four players. There is no audience. All matches are the best of four with three points awarded for a win and one point for a draw. The 32 players that top the group tables qualify for the group winners' stage, consisting of eight groups of four players, and the eight winners from the group winners' stage qualify for the two final groups. The winners of these two groups play a best-of-five final. The champion takes a place in that year's Champion of Champions.

Maximum breaks

There have been 15 maximum breaks in the history of the tournament.^[4] Shaun Murphy made the first in 2014.^[5] Barry Hawkins and David Gilbert both made maximums in 2015,^[6][7] and Gilbert made the 147th maximum in 2019.^[8] Fergal O'Brien made one in 2016,^[9] and Mark Davis made two in 2017.^[10][11] Martin Gould and Luca Brecel both made maximums in 2018,^[12][13] and Ryan Day made one in 2020.^[14] John Higgins made maximums in both 2020^[15] and 2024.^[16] Stuart Bingham made one in 2021^[17] as did Kyren Wilson and Joe O'Connor in 2024.^[18][19]

There were three maximum breaks achieved during the 2024 tournament, by Kyren Wilson in Group 3,^[18] by John Higgins in Group 5,^[16] and by Joe O'Connor in Group 7.^[19] This is only the third time that three maximums have been made in an event, the first being at the 2012 UK Championship, and the second at the 2017 German Masters.

Invitational version prize fund

• Maximum possible tournament total (since 2013): £205,000 (if all match results are 3‍–‍2)^[1]
• Minimum possible tournament total (since 2013): £152,800 (if all match results are 3‍–‍0)^[1]

Ranking version prize fund

Note: The champion receives a total of £33,000 (£3,000 + £4,000 + £6,000 + £20,000).

• Tournament total: £328,000^[2]