On Funbridge, you are ranked based on deals either using MP scoring (expressed as a %) or IMP scoring (expressed in points), depending on the type of tournament:
- In series tournaments: MP scoring
- In practice tournaments: IMP scoring
- In tournaments of the day: IMP or MP scoring
MP scoring is for tournaments in which a large number of players play the same deals and the goal is to score better than other players.
IMP scoring is rather used for team tournaments where the goal is to reach the biggest possible margin compared to other players.
Warning! Only played deals are taken into account in rankings. All players will be able to be included in the tournament general ranking with their temporary average, even if they have not finished the tournament.
Once a tournament is closed:
- We count 25% for non-played deals in tournaments with MP ranking.
- We count -6 IMPs for non-played deals in tournaments with IMP ranking.
Example of how MP score is calculated
For each deal, you get a result between 0 and 100%.
0% means that you are the only player to have obtained the worst result.
50% means that there are just as many players who have scored better than you as players who have scored worse.
100% means that you are the only player to have obtained the highest score.
How this percentage is calculated:
We determine a maximum score equal to the number of participants in the tournament -1.
We attribute this score to the best player, then -1 point to the next player, and so on up to the last player.
In the case of a tie, players' points are added and divided by the number of ties. The figure obtained is then attributed to each player.
Now it just needs to be converted into a %, i.e. points are multiplied by 100 and divided by the maximum number of points.
Example of a tournament result with 9 players:
Results are: 1 x 650, 4 x 620, 2 x 170, 1 x 140 and 1 x 110.
The points obtained are:
8 points for 650, which will give the following result: 8 x 100 ÷ 8 = 100%
(7+6+5+4)/4, i.e. 5.5 points for 620, which will give the following result: 5.5 x 100 ÷ 8 = 68.75%
(3+2)/2, i.e. 2.5 points for 170, which will give the following result: 2.5 x 100 ÷ 8 = 31.25%
1 point for 140, which will give the following result: 1 x 100 ÷ 8 = 12.5%
0 point for 110, which will give the following result: 0 x 100 ÷ 8 = 0%
Example of how IMP score is calculated
You play 3NT with 9 top tricks (already acquired):
In tournaments with MP scoring, you will need to try to take an extra trick (sometimes at the risk of going down in the contract), whereas for IMP scoring, players will be content with the 9 tricks if there is even the slightest risk of going down in the contract by trying to take an extra one.
Calculating IMP scores is done according to a conversion table which shows the equivalence of each score difference in IMP.
Your opponent plays 3NT with no overtricks: +600 pts.
By making 3NT +1 (+630 pts), the point difference will be 30 points, i.e. a gain of 1 IMP.
However, if you go down, your score will be -100 pts and the difference will therefore be 700 points. So you will lose 12 IMPs.
Conversion table for IMP scores:
|0||0 - 10|
|1||20 - 40|
|2||50 - 80|
|3||90 - 120|
|4||130 - 160|
|5||170 - 210|
|6||220 - 260|
|7||270 - 310|
|8||320 - 360|
|9||370 - 420|
|10||430 - 490|
|11||500 - 590|
|12||600 - 740|
|13||750 - 890|
|14||900 - 1090|
|15||1100 - 1290|
|16||1300 - 1490|
|17||1500 - 1740|
|18||1750 - 1990|
|19||2000 - 2240|
|20||2250 - 2490|
|21||2500 - 2990|
|22||3000 - 3490|
|23||3500 - 3990|
|24||4000 et plus|
The previous table is used as it is when comparing 2 teams to each other. For instance, a 30 point difference on a deal is worth 1 IMP.
However, when the comparison includes hundreds of players as on Funbridge, each result is then compared to the average score for the deal. Therefore, the IMP score of some players who do not have the same score may be identical. For instance:
A tournament for which the average score for the deal is 205.
Player X: a score of 630 results in a 425 (630-205) point difference.
Player Y: a score of 660 results in a 455 (660-205) point difference.
Both point differences, i.e. 425 and 455, fall within the same range: 420 -> 490 = 10 IMPs.
Please note that this method of calculation is also used by the French Bridge Federation and the World Bridge Federation (WBF).