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.

Weasel Moot XII 2018
Date September 1-2, 2018 Place Chicago
Number of players28 Number of rounds3 Number of boards9
Coeff 110.00 Coeff 2- Coeff 3-

RankFirstName LastNameLoc.Nat.Score
1Eric GRINNELL98.21
2Edward TANNER94.64
3Chris MARTIN91.07
4Jim O'KELLEY87.50
5Christian KLINE83.93
6David SPANOS80.36
7Zach MOORE76.79
8Thaddäus STRUK73.21
9Matt SUNDSTROM69.64
10Jorge ZHANG66.07
11Brian SHELDEN62.50
12Grant SMITH58.93
13Brad BLITSTEIN55.36
14Tony PROKES51.79
15Andrew KATCHER48.21
16Chris KELLY44.64
17Eric BROWN41.07
18James CALABRESE37.50
19Rob COAN33.93
20Mike MORRISON30.36
21Brandon FOGEL26.79
22Chris GLASSBURN23.21
23Kevin O'KELLY19.64
24Ali ADIB16.07
24Ericson BROWN16.07
24Tyrone FERGUSON16.07
24Don GLASS16.07
24Paul PIGNOTTI16.07

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