World Diplomacy Database

The World Diplomacy Database


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WDD Battle Ranking System Scoring System Event's report Statistics

Other ranking system

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.

CODCon Open 2010
Date April 10-11, 2010 Place Glen Ellyn
Number of players24 Number of rounds3 Number of boards8
Coeff 18.86 Coeff 2- Coeff 3-

RankFirstName LastNameLoc.Nat.Score
1Christopher M. DAVIS97.92
2Thom COMSTOCK93.75
3Peter YEARGIN89.58
4Andrew BARTLEIN85.42
5Jim O'KELLEY81.25
6Grant SMITH77.08
7Mike FRENCH72.92
7Tony PROKES72.92
9Christian KLINE64.58
10Bert SCHOOSE60.42
11Ray SETZER56.25
12Amanda BAUMGARTNER52.08
13May Ling CHONG47.92
15Dan BURGESS39.58
15Kurt KUGELBERG39.58
17Adam BEREY31.25
18Don GLASS27.08
19Nathan COCKERILL22.92
19John DUCA22.92
19Greg DUENOW22.92
19John GRAMILA22.92
19Mike MORRISON22.92

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