ERSI stands for ELO Ranking System Integration. It is Gulf
Billiards Network’s ranking layer for tournament play.
It tracks player progression using ELO-based ratings.
It keeps familiar billiards categories such as C, B, A, and Pro or other Regional Categories.
It makes ranking movement easier for players and organizers to understand.
Purpose
ERSI supplements existing systems
ERSI is not designed to replace club, regional, or community ranking systems.
It adds a transparent digital layer that can work alongside them.
Existing local judgement and community knowledge still matter.
ERSI adds trackable match history and rating movement.
The system helps compare player performance across tournament settings.
Categories
How the categories work
Players are normally confirmed into C, B, A, or Pro. ERSI then
uses finer internal categories to show more precise movement over time.
C group: C-, C, C+
B group: B-, B, B+
A group: A-, A, A+
Pro remains the highest competitive category.
Rating Movement
How ELO ratings move
ERSI compares both players’ ratings after an eligible ranked match. The winner
gains points and the loser loses points, but the amount depends on the expected result.
Beating a stronger player gives a larger rating reward.
Beating a much lower-rated player gives a smaller reward.
Ratings become more meaningful as more ranked matches are recorded.
Score Margin
Why the final score matters
ERSI uses the match winner as the main ranking signal, but it also applies a
controlled score-margin adjustment.
A 5–0 win can carry slightly more weight than a 5–4 win.
A narrow loss against a much stronger player is treated with more context.
The score-margin effect is capped so results do not distort the ranking system.
K-Factor
Why the first 10 matches matter
ERSI uses category-based provisional K-factors during a player’s first 10 ranked matches.
Higher categories use lower K-factors to provide greater stability.
The first 10 ranked matches use provisional K-factors: C 32, B 30, A 28, and Pro 26.
After 10 matches, standard K-factors apply: C 22, B 20, A 18, and Pro 16.
C-, C, and C+ share the C factor; B-, B, and B+ share the B factor; A-, A, and A+ share the A factor.
Tournament Use
How ERSI supports tournaments
ERSI helps organizers understand player strength, support fairer divisions,
seed players more effectively, and recognize player progression across events.
Only eligible ranked matches should affect official ratings.
Confirmed player profiles protect ranking integrity.
ERSI can support future tournament balancing and handicap planning.
Ranking Confirmation
Why players must be confirmed
New players do not automatically become officially ranked. Their starting category
should be confirmed by an authorized admin, organizer, or ranking representative.
Ranked Match Eligibility
Which matches count?
ERSI should process only eligible ranked matches. Both players should be registered,
confirmed, and ranking-enabled. BYEs, placeholder players, incomplete scores, and
unconfirmed profiles should not affect official rankings.
Integrity
What if a score is wrong?
Once a ranked match has been processed, rating movement should not be casually
overwritten. Corrections should be handled through controlled admin or organizer review.
Summary
What ERSI brings to the community
ERSI gives Gulf Billiards Network a scalable way to connect tournament performance
with long-term player development. It keeps familiar player categories, adds
ELO-based progression, includes controlled score-margin context, and supports
transparent tournament planning.