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 27 2013
Date May 24-26, 2013 Place Chapel Hill
Number of players23 Number of rounds3 Number of boards9
Coeff 18.57 Coeff 2- Coeff 3-

RankFirstName LastNameLoc.Nat.Score
1Tom KOBRIN97.83
1Adam SIGAL97.83
3Graham WOODRING89.13
4Peter YEARGIN84.78
5Andy BARTALONE80.43
6Ike PORTER76.09
8Jeff LADD67.39
8Brian LEE67.39
10Jim O'KELLEY58.70
11Chris MARTIN54.35
12Nathan BARNES50.00
13Michael BINDER45.65
14Jay HEUMANN41.30
15Brian ECTON36.96
16Arthur PRICE32.61
17Danny GRINNELL28.26
18Heath GARDNER23.91
19Richard MALTZ19.57
20Jason MASTBAUM15.22
21Eric GRINNELL10.87
22Jimmy KOEHLER6.52

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