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.

Dixie 30 2016
Date May 27-29, 2016 Place Chapel Hill
Number of players36 Number of rounds3 Number of boards13
Coeff 112.29 Coeff 2- Coeff 3-

RankFirstName LastNameLoc.Nat.Score
1Tom KOBRIN98.61
2Chris MARTIN95.83
3Emily POLLOCK93.06
4Peter YEARGIN90.28
6Adam SIGAL84.72
7Andrew GOFF81.94
8Jeff DWORNICKI79.17
10Jeff LADD73.61
11David MALETSKY70.83
11David MILLER70.83
13Jason MASTBAUM65.28
14Danny GRINNELL62.50
15David NORMAN59.72
16Greg MYERS56.94
17Keith WEST54.17
18Hudson DEFOE51.39
19Christian WEST48.61
20Andy BARTALONE45.83
20Ken PEEL45.83
22Ken MATHIAS40.28
23Brian LEE37.50
24Brian SHELDEN34.72
25Marc HURWITZ31.94
26Claude WORRELL29.17
27Alex RONKE26.39
28Dan POLLOCK23.61
29Brian ECTON20.83
30Eric GRINNELL18.06
31Colin WEST15.28
32Todd CRAIG12.50

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