PLAY-OFF AND TIE-BREAK REGULATIONS

Approved by FIDE Council on 01/08/2023

Applied from 1st September 2023 for all FIDE competitions under the aegis of EVE and GSC; from 1st April 2024 for all FIDE-rated competitions.

1.      Scope

These regulations shall apply to all FIDE-rated competitions.

• Note: See article 4.1.

2.      Ranking of Tied Participants (Players or Teams)

2.1     The regulations of the tournament shall specify whether tied participants will share the same place in the standings or, if not, a method for ranking them.

2.2     The available methods of ranking tied participants are:

• Over-the-Board play-offs (see Article 3)
• Off-the-Board tie-breaks (see Article 4 onwards)

3.      Play-offs

3.1     If play-offs are required, the following parameters shall be set out in the specific tournament regulations, as needed:

3.1.1      Whether play-offs are for all tied positions, or specific tied positions (e.g. 1^st place only)

3.1.2      Whether qualification for play-offs applies after application of none, some or all of the tie-breaks selected in Article 4.1.

3.1.3      The format (e.g. Round Robin or Knockout)

3.1.4      The method by which pairing numbers are allocated.

3.1.5      The method by which colours are allocated.

3.1.6      The time limit(s) for all of the games

3.1.7      The schedule for the games, or the break between each game

4.      Tie-Breaks

4.1     They shall take the form of an ordered list of tie-breaks chosen by the Chief Organiser either among those listed in Article 5, or self-defined in the specific regulations of the tournament.

If necessary, the Chief Arbiter shall complete the list by choosing additional tie-breaks from those listed in Article 5 and publish the list before the start of the tournament.

4.2     For the final tournament standings, participants shall be ranked in the order specified by the respective tie-break, starting from the first specified tie-break, and moving to the next in the list whenever a persisting tie cannot be broken. When the tie-break list is exhausted, any remaining tie should be broken by drawing of lots.

4.3     These tie-breaks calculate an evaluation which may be based on:

Type A   a subset of the games by the tied participants.

Tie-Breaks of this type may appear multiple times in the tie-break list.

Type B   participants' own results, so their value can be calculated or predicted by the involved participants before or during their own games.

Type C   opponents' (final) results, so they can be calculated only at the end of the round or tournament.

Type D   opponents' prior known data (e.g. ratings, but also results of previous rounds), so their values can be calculated after the pairings are published (i.e. before the games are played)

or some combination of all the above.

4.4     If two participants play each other more than once, each game or match will be treated as a separate encounter (except as provided in Article 6.1.2). Consequently, the data of the opponents (e.g. ratings, scores) will be used in sums and averages as many times as the two participants played each other.

5.     Tie-Breaks List and Description

6.      Direct Encounter (DE) (Type A, i.e. multi-listable)

6.1     If some or all the tied participants have met each other, the sum of the scores from these encounters is used to produce separate standings, with the following caveats:

6.1.1      forfeited games not covered by Article 15.2 are excluded unless the specific regulations of the tournament state otherwise - when included, forfeited games are equivalent to games played.

6.1.2      contrary to the provisions of Article 4.4, if two participants have met more than once, the addend to be used by them in the aforementioned sum is the average score of these games.

6.2     If all the tied participants have met each other, the separate standings determine all rankings among them, except for any further ties among any subset of them, for which Article 6 shall be reapplied until no further ties can be resolved.

6.3     In Swiss tournaments, if the tied participants have not played all the games against each other, but one of them will be alone at the top of the separate standings whatever the outcome of the missing games, that participant is ranked first among the tied participants – the same applies to the second rank when the first is assigned this way; and so on.

          Article 6 shall then be reapplied to all remaining unranked participants of this set.

7.      Type B Tie-Breaks (based on Participant's own Record)

7.1     Number of Wins (WIN)

The number of rounds where a participant obtains, with or without playing, as many points as awarded for a win.

7.2     Number of Games Won (WON)

The number of games won over the board.

7.3     Number of Games Played with Black (BPG)

The number of games played over the board with the black pieces.

7.4     Number of Games won with Black (BWG)

The number of games won over the board with the black pieces.

7.5     (Sum of) Progressive Scores (PS)

After each round a participant has a certain tournament score. This tie-break is calculated adding the score of the participant at the end of each round.

7.6     Games one Elected to play (GE)

The number of rounds reduced by the number of half-point-byes, zero-point-byes or forfeit losses that a participant had in the tournament.

8.      Buchholz and other Tie-Breaks related to Buchholz

8.1     Buchholz (BH)

The sum of the scores of each of the opponents of a participant.

8.2     Average of Opponents' Buchholz (AOB)

The average of the Buchholz score of the opponents played over the board.

8.3     Fore Buchholz (FB)

Buchholz score calculated as if all paired games for the final round had ended in draws.

See Article 16 for Unplayed Rounds Management.

9.      Tie-Breaks based on both participant's and opponents' results

9.1     Sonneborn-Berger (SB)

It is calculated by adding, for each round, a value given by multiplying the final score of the opponents by the points scored against them. See Article 16 for Unplayed Rounds Management.

9.2     Koya System (for Round Robin) (KS)

The number of points achieved against all participants who have scored at least 50% of the maximum possible tournament score.

10.    Ratings-based Tie-Breaks

These tie-breaks must be dropped from the tournament tie-break list when unrated players are present unless detailed rules on the handling of unrated players are included in the tournament regulations or established and published by the Chief Arbiter before the start of the tournament.

10.1   Average Rating of Opponents (ARO)

The average of the ratings of the opponents played over the board, rounded to the nearest whole number (0.5 rounded up).

10.2   Tournament Performance Rating (TPR)

Calculated adding to ARO a number (called rating difference (RD) - which may be negative) resulting from the conversion of the fractional score (number of points achieved in games played over the board divided by the number of games) into RD (see the corresponding conversion table in the FIDE Rating Regulations).

10.3   Perfect Tournament Performance (PTP)

This is a whole number corresponding to the lowest rating that a participant should have for their expected score to be greater than or equal to their tournament score.

The expected score is the sum of the scoring probabilities which are defined in the FIDE Rating Regulations by the conversion table of rating differences into scoring probabilities.

Each rating difference is calculated by using the aforementioned lowest rating and the rating of each opponent faced by the participant during the tournament.
The full rating scale is used in this conversion (i.e. no ±400 cut).

10.4   Average [Tournament] Performance Rating of Opponents (APRO)

The average of the performances (TPR) of the opponents played over the board, rounded to the nearest whole number (0.5 rounded up).

10.5   Average Perfect [Tournament] Performance of Opponents (APPO)

The average of the perfect performances (PTP) of the opponents played over the board, rounded to the nearest whole number (0.5 rounded up).

11.    Team Tie-Breaks

11.1   In team tournaments each match between two teams may report two types of scores:

11.1.1    Match Points (MP)

Points assigned to a team-win, team-draw, and team-loss.

11.1.2    Game Points (GP)

Sum of the individual points that each player of the team scores.

12.    Tie-Breaks Specific for Team Knockouts

Even though these tie-breaks may be used in team competitions (see Article 13), and are described as such, they are specific for team knockouts when both teams have the same number of match points and game points.

Just for these tie-breaks:

• individual forfeit wins or losses are considered as standard wins or losses.
• if the team received a pairing-allocated bye, the game points considered for each board are the same as those assigned to a standard win.

12.1   Board Count (BC)

It is calculated by adding for each board a value given by multiplying the number of game points scored on that board (regardless of who was playing on it) by the number of the board (e.g. one for first board, two for second board).

The lower the total, the higher the ranking.

It can only be used when all tied teams have (scored) the same number of game points.

12.2   Top Board Results (TBR)

This is the number of game points achieved on the first board in all games played by the team in the tournament, regardless of who was playing on that board.

If the results on the top board are not decisive, reapply this tie-break to the top-most board not yet counted. Continue reapplying this tie-break in the same way until the tie is broken.

12.3   Bottom Board Elimination (BBE)

This is the number of game points achieved on all boards except for the bottom board in all games played by the team in the tournament, regardless of who was playing on those boards.

If excluding the bottom board is not decisive, reapply this tie-break to the bottom-most board not yet excluded. Continue reapplying this tie-break in the same way until the tie is broken.

13.    Tie-Breaks Specific for Team Competitions

All tie-breaks described in Articles 6-10, or some variation of them, may be also applied for teams, using teams MP or GP as the reference score for the team – the primary score being the default, if the reference score is not explicitly indicated.

13.1   Match Points or Game Points (MPvGP)

Match Points in team competitions that are decided by Game Points or Game Points in team competitions that are decided by Match Points.

13.2   Extended Sonneborn Berger (ESB) for Teams

Combining MP and GP, four combinations of Sonneborn-Berger tie­breaks are available. Any of them or any combinations of them can be used. Each (Extended) Sonneborn-Berger tie-break is calculated adding for each opponent a value given by the product of two elements:

• the total number of MP or GP achieved by the opponent at the end of the tournament.
• the number of MP or GP scored against that opponent.

The four possibilities are: 

13.2.1    EMMSB             Total MP opponent × MP scored.

13.2.2    EMGSB              Total MP opponent × GP scored.

13.2.3    EGMSB              Total GP opponent × MP scored.

13.2.4    EGGSB               Total GP opponent × GP scored.

See Article 16 for Unplayed Rounds Management.

13.3   Extended Direct Encounter for Teams (EDE)

13.3.1    Apply the Direct Encounter rule (Article 6), first using the primary score (MP or GP), then, if all the teams are still tied, using the secondary score.

13.3.2    If exactly two teams are still tied in both MP and GP, the rules of a competition must specify whether the Tie-Breaks specific for Team Knockouts apply (Article 12), and, if so, which ones and in what order.

13.3.3    Any time a new subset of tied teams is determined, restart with the new subset from 13.3.1.

13.4   Scores and Schedule Strength Combination (SSSC)

This tie-break adds together two elements:

13.4.1    the secondary score of a team (GP if the primary score is given by MP, or vice versa).

13.4.2    a value that represents the strength of its opposition (called Schedule Strength). This value is the result of a division between:

1. [dividend] Buchholz of the team, based on the primary score (note: if the tie-break value must be known before playing, use Fore Buchholz).
2. [divisor] a normalising factor, given by the highest achievable primary score divided by the highest secondary score achievable in a single game, rounded to the nearest integer towards zero, or by a different value if stated by the rules of the competition. 

14.    Modifiers

Each tie-break based on a sum of values (that can come from either results, ratings or any value calculated using them) can be redefined by applying a modifier, which is a way to vary the elements that are part of the calculation, usually excluding some of these elements or, more rarely, adding some:

14.1   Cut-1: Cut the Least Significant Value

14.1.1    It is the most used modifier, applicable in many tie-breaks. The most commonly used are:

1. Buchholz Cut-1 (BH-C1, exclude the opponent with the lowest number of points)
2. ARO Cut-1 (ARO-C1, exclude the opponent with the lowest rating)
3. Progressive Score Cut-1 (PS-C1, exclude the score achieved after the first round)
4. Sonneborn-Berger Cut-1 (SB-C1, exclude the opponent with the lowest score - if more than one, exclude the one with which the worst result was achieved).

14.1.2    In team competition, all the Extended Sonneborn-Berger tie-breaks for teams (see Article 13.2) are calculated excluding one of the opponents with the lowest primary score (MP for EMMSB and EMGSB, or GP for EGMSB and EGGSB) - having the choice the one with which the worst result was achieved.

14.2   Cut-2: Cut the two Least Significant Values

Most commonly used is Buchholz Cut-2 (BH-C2).

14.3   Median­1: Cut the Least and the Most Significant Values (in that order)

Most commonly used is Buchholz Median-1 (BH-M1).

14.4   Median­2: Cut the two Least and the two Most Significant Values (in that order)

Most commonly used is Buchholz Median-2 (BH-M2).

14.5   Limit: Change a Limit

The most common modification is in Koya: the limit of 50% of the maximum possible tournament score can be either increased or decreased of half point at a time to let respectively less or more participants contribute to the evaluation of the tie-break.

14.6   All modifiers are subject to Unplayed Rounds Management (see Article 16).

15.    Unplayed Rounds

15.1   An unplayed round is any round in which a participant, paired or not, did not play a game in an individual tournament, or a match in a team tournament.

15.2   In tournaments with pre-determined pairings, forfeited games (the only possible unplayed rounds) are treated as regular games.

15.3   For Swiss tournaments, apply Article 16.

16.    Unplayed Rounds Management in Swiss Tournaments

In Individual or Team Swiss tournaments, the tie-breaks Buchholz (see Article 8.1), Sonneborn-Berger (see Articles 9.1 and 13.2) and their variants (Fore Buchholz, see Article 8.3; and "Cut" Modifiers, see Articles 14.1 to 14.4), which are directly or indirectly based on opponents' results, are affected by the presence of unplayed rounds in the record of participants.

16.1   The following definitions are used in this section:

16.1.1    requested bye: a half-point-bye or a zero-point-bye (note: any round after a participant withdraws is a zero-point-bye)

16.1.2    available-to-play round: any round in which a participant played their game, or ended up without a game due to a pairing-allocated bye, the opponent did not arrive to play, or unforeseen circumstances that resulted in the award of a full-point-bye

16.2   Unplayed rounds can be divided into the following categories:

16.2.1    Pairing-allocated byes or full-point byes

16.2.2    Forfeit wins

16.2.3    Requested byes that are followed by at least one available-to-play round

16.2.4    Forfeit losses

16.2.5    Requested byes that are not followed by any available-to-play rounds

16.3   When a participant has unplayed rounds, for the sole purpose of calculating the tie-break of their opponents, the participant's score is adjusted in the following way:

16.3.1    Unplayed rounds of categories 16.2.1, 16.2.2, 16.2.3 and 16.2.4 are evaluated with the result (win, draw, loss) corresponding to the awarded number of points or, for teams, match points and game points.

16.3.2    Unplayed rounds of category 16.2.5 are evaluated as draws.

16.4   To calculate the participant's own tie-break, any of their unplayed rounds are evaluated as if there was a game played against a dummy that has the same number of points as the participant themself, and ended with the result (win, draw, loss) corresponding to the awarded number of points.

Note: For team competitions, "points" means "match points and game points".

16.5   When a modifier is used that calls for cutting the least significant value (see Articles 14.1 to 14.4), the tie-break score for a participant that has forfeit losses or requested byes among their unplayed rounds is instead calculated by cutting the lowest contribution coming from unplayed rounds of this kind, as long as such contribution is not lower than the least significant value - if it is lower, there is no exception: the least significant value is cut (see Article 14.1).

16.6   The rules of the competition may specify in advance alternative provisions to Articles 16.3, 16.4 or 16.5.