GPCF Tiebreaks

Tiebreaks

GPCF tournaments when necessary will use the following Tiebreak Systems
 in the order listed as calculated by the Swiss-Sys Pairing Program.

1.  Solkoff

This evaluates the strength of a player's opposition by summing the final scores of his or her opponents.

2.  Modified median

This evaluates the strength of a player's opposition by summing the final scores of his or her opponents and then discarding either the highest of these scores, the lowest, or both, depending on the tied player's score.

For players who tie with even scores (that is, their number of wins and losses is the same), both high and low are discarded. For tied players with plus scores, only the lowest is discarded, and for players with minus scores only the highest is discarded.

For tournaments of nine or more rounds, the top two scores are discarded (or the bottom two scores, or all four, as determined by the same even/plus/minus criteria above).

These scores are adjusted for any unplayed games, which count a half point each. If the player involved in the tie has any unplayed games, they count as opponents with adjusted scores of 0.

3.  Sonneborn-Berger

For each player in the tie, add the final scores of all the opponents the player defeated and half the final scores of all the opponents with whom the player drew. 

4.  Performance of opposition

This method averages the performance ratings of the players' opposition. 

5.  Average opposition

This averages the ratings of the player's opponents.