World Diplomacy Database

The World Diplomacy Database


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WDD Battle Ranking System Scoring System Event's report Statistics

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Dip Pouch Tournament Rating
AuthorMatt Shields Last Update2019-10-09
International ranking National ranking
List of included tournaments List of included circuits

Each player begins with an initial rating of 40 before their first tournament. After each event, a player's final placement (e.g. 1st, 2nd, 3rd, etc.) is converted to a percentile score.

The formula used is: (([Number of Players in the event]+0.5-[Placement])/[Number of Players in the event])*100

If the event was the World Championship, the tournament value is 20.
Otherwise, if the tournament has only one round, the tournament value is equal to the number of players in the event divided by 7, plus 2. If the event has more than one round, the tournament value is equal to the number of players in the event divided by 3.5, plus two. ( (#players/3.5)+2 ). However, the maximum tournament value for any non-world championship event is 15.

Events before 2001, with the exception of World Championships, have a tournament value of zero, meaning they have no effect on ratings. The theory is that results be based only on the last ten years of competitive play.

As an example of calculating new ratings, suppose a player enters an event with a rating of 55. Suppose also that they finish in 8th place out of 65 players. The player's percentile score is (65 + 0.5 - 8)/65 * 100 = 88.46. A 65 player event would have a tournament value of (65/3.5) +2 = 20.57. However, since the maximum tournament value is 15, that will be the value for this event. Therefore, this player's rating will move 15% of the distance from 55 to 88.46. The difference between 88.46 and 55 is 33.46. 15% of 33.46 is 5.019. Therefore, we add 5.019 points to this player's rating as a results of this event, meaning their rating increases from 55 to 60.019.

WAC 4 2007
Date January 18-20, 2007 Place Seattle
Number of players34 Number of rounds5 Number of boards19
Coeff 111.71 Coeff 2- Coeff 3-

RankFirstName LastNameLoc.Nat.Score
1Dan LESTER98.53
2Eric MEAD95.59
3Jake MANNIX92.65
4Jim O'KELLEY89.71
5Yann CLOUET86.76
6Adam SILVERMAN83.82
7Matt SHIELDS80.88
8Jonathan KEITH77.94
9Cyrille SEVIN75.00
10France-May MARTEL72.06
11Chris PRICHARD69.12
12Andy BARTALONE66.18
13Stephen WEINGARTEN63.24
14Tom KOBRIN60.29
15Andy MARSHALL57.35
16Brad BASDEN54.41
17Micah KRABILL51.47
19Jeremiah PETERSON45.59
20John JAMIESON42.65
21Nathan BARNES39.71
22David MALETSKY36.76
23Marty LUND33.82
24Chris LOCKE30.88
25William SHENG27.94
26Brad ROSMAN25.00
27Dolan MURPHY22.06
28Mark ZOFFEL19.12
29David HOOD16.18
30Edi BIRSAN13.24
31Buz EDDY10.29
32Mary KUHNER7.35
33Brian MURDOCK4.41
34Greg DUENOW1.47

The North American Diplomacy Association The European Diplomacy Association The Diplomacy Association of Australia and New Zealand