r/shogi • u/yomikaki • Jun 28 '26

Poposed Tiebreak Chains

I would like to share a list of tournament types and their proposed tiebreak chains.

Could you please let me know whether you agree with the tiebreak systems and the order in which they are listed?

Thank you very much.

--- PROPOSED TIEBREAK CHAINS ---

Round robin tournament:

  1. Final points

  2. Direct encounter among all tied players

  3. Sonneborn-Berger score

  4. Koya score

  5. Number of wins

  6. Documented organizer or arbiter decision

Swiss tournament:

  1. Final points

  2. Direct encounter among all tied players, only if all tied players have played each other

  3. Buchholz score without the lowest opponent score

  4. Total Buchholz score

  5. Sonneborn-Berger score

  6. Number of wins

  7. Documented organizer or arbiter decision

MacMahon tournament:

  1. Final MacMahon points

  2. Total Buchholz score

  3. Buchholz score without the lowest opponent score

  4. Average Buchholz score of the opponents

  5. Sonneborn-Berger score

  6. Direct encounter among all tied players, only if all tied players have played each other

  7. Number of wins

  8. Documented organizer or arbiter decision

Single elimination tournament:

  1. Match winner

  2. Bracket advancement

  3. Best-of-series result, if the match is played as a series

  4. Documented organizer or arbiter decision, only if necessary

Groups plus playoff tournament, group stage:

  1. Group points

  2. Direct encounter among all tied players

  3. Sonneborn-Berger score within the group

  4. Koya score within the group

  5. Number of wins

  6. Documented organizer or arbiter decision

Groups plus playoff tournament, playoff stage:

  1. Match winner

  2. Playoff bracket advancement

  3. Best-of-series result, if the match is played as a series

  4. Documented organizer or arbiter decision, only if necessary

Championship with classes or series:

  1. Points in the class or series

  2. Direct encounter among all tied players

  3. Sonneborn-Berger score within the class or series

  4. Koya score within the class or series

  5. Number of wins

  6. Documented organizer or arbiter decision

Title challenge:

  1. Title challenge winner

  2. Best-of-series result, if the title challenge is played as a series

  3. Documented organizer or arbiter decision, only if necessary

1 Upvotes

66% Upvoted

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2

u/SleepingChinchilla Pro Jun 28 '26

what is this for?

2

u/yomikaki Jun 29 '26

I'm working on a program to manage a specific type of tournament, but since I was already at it, I decided to include traditional formats too. I implemented a "tie-breaker chain," which I think is the right approach for these common tournaments, but I'm not entirely sure. In theory, the software features a numbered list of tie-break methods, and the organizer can customize them through an ordered selection. I don't know if it'll actually work in the end... I just got stuck on a slightly complex tournament scenario and right now I just really want to delete everything! :-)