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.

WAC 10 2013
Date February 1-3, 2013 Place Seattle
Number of players28 Number of rounds3 Number of boards10
Coeff 110.00 Coeff 2- Coeff 3-

RankFirstName LastNameLoc.Nat.Score
1Andy HULL98.21
2Chris BRAND94.64
3Adam BEREY91.07
4Eric MEAD87.50
5Doug MOORE83.93
6Chris PRICHARD80.36
7Alex COLLINS76.79
8John JAMIESON73.21
9Spiros BOBETSIS69.64
10Siobhan NOLEN66.07
11Ken LEMERE62.50
12Jonathan KEITH58.93
13Ryan WITMER55.36
14Nathan BARNES51.79
15Zach MEISSNER48.21
16Chuck SPIEKERMAN44.64
17Brian MURDOCK41.07
18Mark ZOFFEL37.50
19David SIELAFF33.93
20Zac JARVIE30.36
21Todd DORNIAN26.79
22Stephen MCKEOWN23.21
23Tim SAITO19.64
24Mark DORNIAN16.07
25Kyra OLSON12.50
26Zach HAMILTON8.93
27Matt JUNGE5.36

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