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 6 2009
Date January 23-25, 2009 Place Seattle
Number of players45 Number of rounds4 Number of boards20
Coeff 114.86 Coeff 2- Coeff 3-

RankFirstName LastNameLoc.Nat.Score
1Adam SIGAL98.89
2David MALETSKY96.67
3Jon SAUL94.44
4Conrad WOODRING92.22
5Eric MEAD90.00
6Adam SILVERMAN87.78
7Jim O'KELLEY85.56
8Tim YOCUM83.33
9Andy HULL81.11
10Brian SHELDEN78.89
11Chris BRAND76.67
12Siobhan NOLEN74.44
13Christopher BURGESS72.22
14Chris PRICHARD70.00
15Alex COLLINS67.78
16Alex BRONER65.56
17Kevin O'KELLY63.33
18Edi BIRSAN61.11
19Chris MARTIN58.89
20Stephen WEINGARTEN56.67
21Nathan BARNES54.44
22Mike HALL52.22
23Brian MURDOCK50.00
24Andy BARTALONE47.78
25Mark ZOFFEL45.56
26Brad BASDEN43.33
27Jonathan KEITH41.11
28Jake MANNIX38.89
29Ken LEMERE36.67
30Micah KRABILL34.44
31Eric YARNELL32.22
32Alex AMANN30.00
33Jay HEUMANN27.78
34Nathan SCHLAUD25.56
35Jonathan HILL23.33
36Graham WOODRING21.11
37Sam TYLER18.89
38Kirk PETERSEN16.67
39Wyatt CAMP14.44
40Blane HICKEY12.22
41Jim CAUSEY10.00
43Buz EDDY5.56
44Leroy SMITH3.33

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