Pente.org

Round-Robin

1. All players signed up for a tournament will be split up into sections.
2. The number of players per section will be 3-5, some sections may have 1 less player depending on the number of players in the tournament.
3. Everyone in a section will play 2 games against every other player in the section, one game as player 1, one game as player 2.
4. Each win gets you one point, after all players finish their matches, the 2 players with the most points are the winners of the section. If 2 or more players tie, they are all considered winners.
5. Winners advance to the next round of play where the sectioning is repeated.
6. Eventually there will be a final round with one section, the winner of that section is the winner of the tournament. If there is a tie at this point, the same process is used, a new round is created and those players who tied will advance and play again until one player wins.
7. Players will be split up taking into account their rating at Pente.org. I know, some players don't like seeded tournaments, but I think it is necessary. Seeding sections helps to ensure that a group of highly rated players doesn't all end up in the same section. All players are ranked by their rating, then going down the list, players are placed in a section. When we reach the final section, we then go back up the list of sections adding players. In a tournament with the right number of players, all sections would have the same number of players, and the sum of the seeds in a section would be the same for all sections.
   
   As a not very realistic example, consider a tournament with 8 players. We would start with 2 sections of 4 players each. The 1st seeded player would be placed in section 1. The 2nd seeded player would be placed in section 2. We've reached the last section, so the 3rd seeded player would also be placed in section 2, and the 4th player would be placed in section 1 and so on until all 8 players are placed. The final sections would look like this.
   8 players, 2 sections of 4 players
   Section 1: 1st, 4th, 5th, 8th seeds, sum = 1 + 4 + 5 + 8 = 18
   Section 2: 2nd, 3rd, 6th, 7th seeds, sum = 2 + 3 + 6 + 7 = 18
   This example just illustrates how the sections are determined, but doesn't really show why it is done this way, consider instead a tournament of 37 players with 4 players per section.
   
   37 players, 10 sections of 4 players/section
   Section 1: 1st, 20th, 21th, 37th seeds, sum = 79
   Section 2: 2nd, 19th, 22th, 36th seeds, sum = 79
   Section 3: 3rd, 18th, 23th, 35th seeds, sum = 79
   Section 4: 4th, 17th, 24th, 34th seeds, sum = 79
   Section 5: 5th, 16th, 25th, 33th seeds, sum = 79
   Section 6: 6th, 15th, 26th, 32th seeds, sum = 79
   Section 7: 7th, 14th, 27th, 31th seeds, sum = 79
   Section 8: 8th, 13th, 28th seeds, sum = 49
   Section 9: 9th, 12th, 29th seeds, sum = 50
   Section 10: 10th, 11th, 30th seeds, sum = 51
   It should be more obvious now the point of this sectioning. In this example the top 20 players all have a decent shot of advancing to the next round, and seeds 21,22,23 also have a good chance. It makes sense that the best players in the tournament advance to higher rounds. Also, in this example, the last 3 sections only have 3 players, the higher number sections will always be the ones with smaller numbers of players.
   Update: Now the layers of the sections will be shuffled as well. In the above example, layer 1 consists of seeds 1 to 10, layer 2 of seeds 11 to 20, and so on. The players within each layer are shuffled randomly before being assigned to a section. No 2 players from the same layer will end up in the same section for that round.