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 3 2006
Date January 27-28, 2006 Place Seattle
Number of players36 Number of rounds5 Number of boards21
Coeff 112.29 Coeff 2- Coeff 3-

RankFirstName LastNameLoc.Nat.Score
1Jim O'KELLEY98.61
2Eric MEAD95.83
3Jerry FEST93.06
4Andy MARSHALL90.28
5David HOOD87.50
6Andy BARTALONE84.72
7Doug MOORE81.94
8Adam SILVERMAN79.17
9Yann CLOUET76.39
10Edward HAWTHORNE73.61
11Dan LESTER70.83
12Brad ROSMAN68.06
13Matt SHIELDS65.28
14Jake MANNIX62.50
15Andrew NEUMANN59.72
16Brad BASDEN56.94
17Micah KRABILL54.17
18Doug SCOTT51.39
19David MALETSKY48.61
20Marty LUND45.83
22Riaz VIRANI40.28
23Jon SAUL37.50
24Kirk PETERSEN34.72
25Nathan BARNES31.94
26Brian MURDOCK29.17
27Len TENNANT26.39
28Mike HALL23.61
29Mark ZOFFEL20.83
30Edi BIRSAN18.06
31Eric OZOG15.28
32Thane WALKUP12.50
33Stephen WEINGARTEN9.72
34Chris MARTIN6.94
35Buz EDDY4.17
36Janusz OSTRYCHARZ1.39

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