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.

Tempest in a teapot IX 2007
Date October 5-7, 2007 Place Falls Church, Virginia
Number of players41 Number of rounds3 Number of boards15
Coeff 113.71 Coeff 2- Coeff 3-

RankFirstName LastNameLoc.Nat.Score
1Chris MAZZA98.78
2Andy BARTALONE96.34
3Thom COMSTOCK93.90
4Christian PEDONE91.46
5Doug MOORE89.02
6Seth VAUGHN86.59
7Chris MARTIN84.15
8Graham WOODRING81.71
9Bruce RAY79.27
10Stephen MAURIS76.83
11Evan PERLMAN74.39
12Brian SHELDEN71.95
13Melissa CALL (nee NICHOLSON)69.51
14Ben MELENSON67.07
15Jim O'KELLEY64.63
16Grant SMITH62.20
17Brian LEE59.76
18Ike PORTER57.32
19Steve EMMERT54.88
20Greg BAKER52.44
21Michael MC MILLIE50.00
22Brent DORMAN47.56
23David MALETSKY45.12
23Tim YOCUM45.12
26Jeff LADD37.80
27Donald WOODRING35.37
28John BARRINGER32.93
29Sean CABLE30.49
30Rich O'BRIEN28.05
31Joe WHEELER25.61
32David ZUCKERMAN23.17
33Dorian KEY20.73
34Brad RAPPAPORT18.29
35John DVORAK15.85
36Jeremiah PETERSON13.41
37Andy MARSHALL10.98
38Mike BARUCH8.54
39Mike HALL6.10
40Corey MASON3.66
41Kai HSIEH1.22

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