Rating

What is ELO rating ?

Your ELO rating for a game is your level at this game. It's a 4 digits number followed by sign .

Example: 1648 .

If you never play a game on BGA, your initial rating is 1500 . Each time you win a game your rating increases, and it decreases each time you lose a game.

How many points do I gain / lose for each game ?

ELO points gains / losses depend on the level of your opponents, and your rank at the end of the game. Some examples:

• If you end the game at a better place than a player with a higher ELO, you gain a lot of points.
• If you end the game at a better place than a player with a lower ELO, you gain less points.
• If you end the game at a worse place than a player with a lower ELO, you loose a lot points.
• And so on...

Some advice

• There's no use beating players a lot weaker than you (not many points to win). Try to find opponents of your level: it's both more fun and more good for your ELO.
• The number of ELO points you can gain/lose during a game increases with the number of players. The maximum is reached when there is the "recommended number of players". Try to play games with this recommended number of players.
• When you are the first player to quit a game in progress, you loose as many points as if you would finish the game at the last place, plus an additional penalty of 10 points. Even if you are in a difficult situation, your interest is to play the game until the end - or concede the victory to your opponent.

How is my ELO ranking computed ?

The BGA ELO system is inspired by the standard ELO rating system, in use for chess.

Let's try to make it simple: the points you win/lose after each game depends on the ranking of your opponents. If you win at a table with opponents stronger than you, your ranking will increase a lot. If you lose at the same table, your ranking will decrease a little. And so on ...

In case there are more than 2 players at the table, we take into account the final rank. This is the reason it is important to continue fighting for the second place during the game if you think you can't win.

Okay, but I want to know the formula !

At first, when someone left a game for any reason this game is not taken into account by the ELO rating system.

• Table Level (TL) is the average of ELO ratings of all players at this table.
• The success (S) of a player depends directly on its ranking at the game, from S=+470 (winner of the game) to S=-470 (last player).
• The performance (P) of a player is TL+S.
• The new ELO rating (Rn) is a weighted average of the previous ELO rating (Rp) and the performance: Rn = K.P + (1-K).Rp

Good players, Experts, Masters

• Good players: > 1600 ELO
• Experts: > 1800 ELO
• Masters: > 2000 ELO