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 2 2005
Date January 21, 2005 Place Seattle
Number of players37 Number of rounds4 Number of boards18
Coeff 112.57 Coeff 2- Coeff 3-

RankFirstName LastNameLoc.Nat.Score
1Andrew NEUMANN98.65
2Eric MEAD95.95
3Chris MARTIN93.24
4Yann CLOUET90.54
5Riaz VIRANI87.84
6David MALETSKY85.14
7Edi BIRSAN82.43
8Brad BASDEN79.73
9Mary KUHNER77.03
10Jeff DWORNICKI74.32
11Jon SAUL71.62
12Matt SHIELDS68.92
13Andy MARSHALL66.22
14Jerry FEST63.51
15Nathan BARNES60.81
16Manus HAND58.11
17Melissa CALL (nee NICHOLSON)55.41
18Doug SCOTT52.70
19Brad ROSMAN50.00
20Andy BARTALONE47.30
21Adam SILVERMAN44.59
22Jake MANNIX41.89
23Ken LEMERE39.19
24Stephen WEINGARTEN36.49
25Len TENNANT33.78
26Rick DESPER31.08
27Eric YARNELL28.38
28Mark ZOFFEL25.68
29Benjamin CHENG22.97
30Robert O'CONNOR20.27
31Rob ZOFFEL17.57
32Buz EDDY14.86
33Brian MURDOCK12.16
34Jeff SUCHAREW9.46
35Janusz OSTRYCHARZ6.76
36Ben FERGUSON4.05
37Bob GRIMM1.35

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