# Ranking system

The ranking system is based on player's Elo level

Billiard is a game of skill and the elo scoring system is calculated according to international standards.

The game uses the international standard elo scoring system. As follows:

- Each person initially has 1200 elo
- Win plus x elo, lose minus x elo
- A high elo player who meets a lower elo player when they win will earn less elo points.
- The PvP competition system will pair players with similar elo points to create fairness.

Supposing 2 opponents A & B play against each other, where:

- A has an Elo level: Ra
- B has an Elo level: Rb
- Formula (1) – calculates for player A: x(A)=Qa/(Qa+Qb)
- Formula (2) – calculates for player B: x(B)=Qb/(Qa+Qb)
- Qa=10^(Ra/400)
- Qb= 10^(Rb/400)

When the game is over

- Win: get 1 point
- Draw: 0.5 point
- Lose: get 0 point

To be recalculated at the end of each game, as follows:

- Person A: Ra' = Ra + K(Aa – Ea)
- Person B: Rb' = Rb + K(Ab – Eb)

Note:

- Aa and Ab are the match scores of the two players, respectively, and
- K is a coefficient that controls inflation and deflation;
- K = 25 for elo under 1600
- K = 20 for elo under 2000
- K = 15 for elo below 2400.
- K = 10 for elo over 2400

Last modified 1yr ago