Game room
| The Giraffe Sowpods | 45 |
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| The Elephant TWL06 | 0 |
| Le morse ODS5 | 0 |
| Il puma Zingarelli | 0 |
| Logged in | 45 |
Rating
The purpose of the rating is to establish your playing skills - not to reward you for winning a game or punish you for losing a game. When faced with an opponent with lower rating you are expected to win by a certain number of points. If you win by fewer points than this expected number of points you have not performed as well as what was expected from you considering your rating. You therefore lose rating even though you win the game. When faced with an opponent with higher rating you are expected to lose by a certain number of points. If you lose by fewer points you have performed better than what your rating would predict and thus you gain rating even though you lose the game.
What affects your rating?
Your rating changes according to a number of factors. The most important factors are the final scores of you and your opponent as well as the ratings of you and your opponent before the game. Another factor affecting the change of rating is how many games you have played. The change of rating is calculated in the same way regardless of board and time settings.
To abort a game
If you abort a game the rating is calculated in the same way as for a regular game. However, if you get an increase in rating, this increase is put to zero, i.e., you can never increase your rating by aborting a game. If your opponent aborts the game and you get a decrease in rating, this decrease is put to zero, i.e., you can never lose rating if your opponent aborts the game. If there has been no action when a game is aborted, none of the players experience a change of rating.
Details
Ap = your final score in the game.
Bp = your opponent’s final score in the game.
Agr = your old rating.
Bgr = your opponent’s old rating.
Am = the number of games you have played.
Your change of rating is given by the formula,
If three or four players are in a game the formula for the change of rating is,
The number of games you have played
To aid in quicker putting a new player at an appropriate rating, the value of the
last bracket in the formulae above is dependent on the number of games you have played. As can be seen in the diagram below (where the vertical axis depicts the value of the last bracket and the horizontal axis depicts the number of games played) the change of rating is three times as large in your first game in comparison to when you have played a larger number of games. This value of the bracket decreases steadily and after about 40-50 games the value is no longer dependent on how many games you have played.
Three cases
The rating calculation becomes different depending on which of the following three cases that occurs,
* Case 1: Both players have a positive final score.
* Case 2: You have a positive final score and your opponent a negative final score.
* Case 3: You have a negative final score.
Case 1: Both players have a positive final score
The diagram depicts a game between two players with a rating of 1500 with a lot of games played. To the right is your final score and to the left is your opponent’s final score. The vertical axis shows your change of rating depending on the outcome of the game. Dark blue and dark red means that you get a maximal decrease or increase in rating, respectively. Green means that your rating does not change. Maximal increase means an as large increase as possible considering the ratings of the players, i.e., when the first factor of the rating calculation formula is 1. Maximal decrease in rating corresponds to the first factor in the formula being 0.
Case 2: You have a positive final score and your opponent a negative final score
The final score of your opponent is set to zero, which means that the first term in the first bracketed factor of the formula becomes 1. This means that you get maximal increase of rating regardless of what final negative score your opponent has.
Case 3: You have negative score
Your final score is set to zero, which means that the first term in the first bracketed factor of the formula vanishes and you get a maximal decrease of rating. Since this term vanished you get the same decrease of rating regardless of your opponent’s final score.
What affects your rating?
Your rating changes according to a number of factors. The most important factors are the final scores of you and your opponent as well as the ratings of you and your opponent before the game. Another factor affecting the change of rating is how many games you have played. The change of rating is calculated in the same way regardless of board and time settings.
To abort a game
If you abort a game the rating is calculated in the same way as for a regular game. However, if you get an increase in rating, this increase is put to zero, i.e., you can never increase your rating by aborting a game. If your opponent aborts the game and you get a decrease in rating, this decrease is put to zero, i.e., you can never lose rating if your opponent aborts the game. If there has been no action when a game is aborted, none of the players experience a change of rating.
Details
Ap = your final score in the game.
Bp = your opponent’s final score in the game.
Agr = your old rating.
Bgr = your opponent’s old rating.
Am = the number of games you have played.
Your change of rating is given by the formula,
If three or four players are in a game the formula for the change of rating is,
The number of games you have played
To aid in quicker putting a new player at an appropriate rating, the value of the
last bracket in the formulae above is dependent on the number of games you have played. As can be seen in the diagram below (where the vertical axis depicts the value of the last bracket and the horizontal axis depicts the number of games played) the change of rating is three times as large in your first game in comparison to when you have played a larger number of games. This value of the bracket decreases steadily and after about 40-50 games the value is no longer dependent on how many games you have played.
Three cases
The rating calculation becomes different depending on which of the following three cases that occurs,
* Case 1: Both players have a positive final score.
* Case 2: You have a positive final score and your opponent a negative final score.
* Case 3: You have a negative final score.
Case 1: Both players have a positive final score
The diagram depicts a game between two players with a rating of 1500 with a lot of games played. To the right is your final score and to the left is your opponent’s final score. The vertical axis shows your change of rating depending on the outcome of the game. Dark blue and dark red means that you get a maximal decrease or increase in rating, respectively. Green means that your rating does not change. Maximal increase means an as large increase as possible considering the ratings of the players, i.e., when the first factor of the rating calculation formula is 1. Maximal decrease in rating corresponds to the first factor in the formula being 0.
Case 2: You have a positive final score and your opponent a negative final score
The final score of your opponent is set to zero, which means that the first term in the first bracketed factor of the formula becomes 1. This means that you get maximal increase of rating regardless of what final negative score your opponent has.
Case 3: You have negative score
Your final score is set to zero, which means that the first term in the first bracketed factor of the formula vanishes and you get a maximal decrease of rating. Since this term vanished you get the same decrease of rating regardless of your opponent’s final score.