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Home > WBaduk > Rating System
World Rating System

1. WBaduk Strength Level System
The strength level system of WBaduk is 18 Kyu to 1 Kyu, Amateur 1 Dan to Amateur 7 Dan and then Pro 1 Dan
to Pro 9 Dan. (Only certified professional players in Korea, China, Japan and Taiwan are admitted as Pro.)
When you sign up for the membership, you can choose your WBaduk strength level between 18 Kyu to Amateur 4 Dan.
Strength levels higher than Amateur 5 Dan are given by the point system of the World rating system.
  WBaduk Strength Rating System
Pro Pro 1 Dan ~ 9 Dan (given only to certified pro player)
Amateur Dan 1D ~ 7D★(8D)
Amateur Kyu 1D ~ 25K

2. The Marking Method of Certified Strength Level

The strength levels certified by Oro Baduk are marked with asterisks (*) so that the strength levels certified
by Oro Baduk can be distinguished from uncertified strength levels. (Pro players are marked with ‘P.’)
e.g., 7K*(Certified 7 Kyu), 6D*(Certified 6 Dan), 5P(Pro 5 Dan)

3. Table of Handicap for Each Strength Level (Dan, Kyu and Pro)
  Pro 7D 6D 5D 4D 3D 2D 1D 1K
Pro 0                
7D 1 0              
6D 2 1 0            
5D 3 2 1 0          
4D 4 3 2 1 0        
3d 5 4 3 2 1 0      
2D 6 5 4 3 2 1 0    
1D 7 6 5 4 3 2 1 0  
1K 8 7 6 5 4 3 2 1 0

4. Types of Games
Games are divided into Rating games and Free games. In case of Rating games, the handicap is set up
automatically according to the table of handicap for each strength level and the result is reflected on the rating system.
In case of Free games, the players can play the game, setting up the handicap regardless of the table of handicap
for each strength level.

5. Result Management
The results of members are managed as the total results, the total rating results and the recent rating results.
The total results are the accumulated results of all games played on the game server after signing up for
the membership. The total rating results are the results of Rating games. The recent rating results are the results
of recent 20 Rating games.

6. What Are Ratings?
The higher level you go up to, the more difficult the ratings become. The rating system is designed in this way
so that the highest Dan can have the honor and the scarcity. You can only promote to 6, 7 and 8 Dan by maintaining
your percentage of victories more than a certain percentage of victories. If you win over an opponent whose rating
points are higher than yours, the points you get from the winning become more. If you are defeated by
an opponent whose rating points are lower than yours, the points you lose from the defeat become more.
The change of points can come out in various ways as the winning streak information and the percentage of
victories are reflected on the points.

7. Table of Rating Standard
Strength Rating point Strength Rating point
- 9K 17,000 ~ 17,999
7D★ 33,000 ~ 10K 16,000 ~ 16,999
7D 32,000 ~ 32,999 11K 15,000 ~ 15,999
6D 31,000 ~ 31,999 12K 14,000 ~ 14,999
5D 30,000 ~ 30,999 13K 13,000 ~ 13,999
4D 29,000 ~ 29,999 14K 12,000 ~ 12,999
3d 28,000 ~ 28,999 15K 11,000 ~ 11,999
2D 27,000 ~ 27,999 16K 10,000 ~ 10,999
1D 26,000 ~ 26,999 17K 9,000 ~ 9,999
1K 25,000 ~ 25,999 18K 8,000 ~ 8,999
2K 24,000 ~ 24,999 19K 7,000 ~ 7,999
3K 23,000 ~ 23,999 20K 6,000 ~ 6,999
4K 22,000 ~ 22,999 21K 5,000 ~ 5,999
5K 21,000 ~ 21,999 22K 4,000 ~ 4,999
6K 20,000 ~ 20,999 23K 3,000 ~ 3,999
7K 19,000 ~ 19,999 24K 2,000 ~ 2,999
8K 18,000 ~ 18,999 25K 1,000 ~ 1,999

a. According to the rating formula, if you win, your points increase and if you lose, your points decrease.
The ranking of all members is displayed based on the rating points.

b. The difference of rating points between each strength level is 1,000 points. If your points become higher than
the point range of your current strength level, your strength level will be promoted. If your points become lower
than the point range of your current strength level, your strength level will be demoted.

c. The points you can get from one game are different according to your strength level. In case that two players have
the same points, if you are 25 Kyu, the points that can be changed according to the result of one game are about
350 points and if you are 7D(8D), the points that can be changed according to the result of one game are about
60 points. The lower your strength level is, the bigger the range of fluctuation gets. The higher your strength
level is, the smaller the range of fluctuation gets.

The reason the points you get are irregular is because the range of fluctuation becomes different according
to your opponent’s points. If you win over an opponent whose rating points are higher than yours, the range of
the points you get gets bigger. If you are defeated by an opponent whose rating points are lower than yours,
the range of the points you lose gets bigger.

d. You can view the range of fluctuation of your points through the rating graph. You can check the ranking of
the whole site and which place you are ranked now.

e. The calculation method for rating points is as follows.

< Calculation of Rating Points >
There are 3 Items that are reflected on your rating points. They are the basic formula, information of
your winning streak or losing streak and information of your percentage of victories

(1) Basic formula
RP(new) = RP(old) + C(S-P)
RP(new) are the new points you get from winning or losing Rating games. RP(old) are your current rating points.
C is a constant. S becomes 1 if you win, S becomes 0 if you lose and S becomes 0.5 if the game ended in a draw,
S is 0.5. P is the chance you might win. C is a constant value that is set up differently according to your strength level.
The range of fluctuation for points you can get is decided by the setup of the C value. If you are a low level player,
your points can change a lot. If you are a high level player, the range of fluctuation for your points is small.
It is because the C value is different according to your strength level. P, the change you might win, is calculated
by the difference between your points and your opponent’s points.

The range of fluctuation for your points at each strength level according to the above formula assuming
that you play the game with an opponent whose points are as same as yours is as follows.
Strength The Lowest points The middle points The highest points
25K 371 367 363
18K 306 301 293
10K 221 215 210
1K 121 116 111
8D 40 35 30

- The lowest points: the points each player gets when players whose points are the lowest among the players
at their strength level play the game with each other
- The middle points: the points each player gets when players whose points are in the middle among the players
at their strength level play the game with each other
- The highest points: the points each player gets when players whose points are the highest among the players
at their strength level play the game with each other

e.g., taking examples of 5 Dan to explain the basic formula,
- When A(RP 30,500) and B(RP 30,500) play the game with each other,
either A and B gets 64 points if A or B wins and either A or B loses 64 points if A or B loses.
- When A(RP 30,000) and B(RP 30,999) play the game with each other,
If A wins, A gets 102 points and if A loses, A loses 36 points.

In case of B, if B wins, B gets 29 points and if B loses, B loses 89 points.

(2) Winning streak and losing streak
Apart from the basic points, if you win or lose in a row, your points increase or decrease. The winning streak points
are applied if you are between 25 Kyu and 7 Dan (the winning streak points are not applied if you are 7 Dan ★.)
The losing streak points are applied to all strength levels from 25 Kyu to 7 Dan ★. The wining streak bonus points
are applied starting from a 3 game winning streak and you can get maximum 100% of the basic points.

(3) Percentage of victories (to the recent 20 games)
The reflection of your percentage of victories on your points is not applicable if your strength level is up to 5 Dan.
The reflection of your percentage of victories on your points is applied if your strength level is between 6 Dan and
7D★(8D). The reason the points you get are small and the points you lose are big when your strength level is
higher than 6 Dan and play the game with an opponent whose strength level is also higher than 6 Dan is because
your percentage of victories and your opponent’s percentage of victories are reflected on the points. The lower your
percentage of victories is, the smaller the points you get.

In this case, your percentage of victories is reflected as the results show if you played the game more than 5 times
at your strength level. However, if you played less than 5 times, 60% of your percentage of victories is calculated
for your percentage of victories.

e.g., taking examples of 7 Dan to explain the reflection of the percentage of victories,
- When A(RP 32,500 / the percentage of victories of 50%) and B(RP 32,500 / the percentage of victories of 50%)
play the game with each other,

either A or B wins 6 points if A or B wins and either A or B loses 44 points if A or B loses.

- When A(RP 32,100 / the percentage of victories of 70%) and B(RP 32,600 / the percentage of victories of 90%)
play the game with each other,
If A wins, A gets 66 points and if A loses, A loses 33 points.
Conversely, if B wins, B gets 30 points and if B loses, B loses 58 points.

As same as the above examples, the percentage of victories is one of the most important factors for getting rating
points if your strength level is higher than 6 Dan.

(4) Other information
- The range of Rating games is up to Amashi handicap games. The applicable Rating games are limited to games
in which more than 50 moves have been proceeded with.
- The lowest points you get when you play the game are 3 points.
- The highest points you can get from one game are different according to your strength level. Adding winning
streak bonus points of 100%, theoretically, you can get more than maximum 700 points if your strength level
is 25 Kyu. If your strength level is 7 Dan, you can still get maximum 200 points. However, it is an extreme
case and it hardly ever happens in actual games.



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and "Seoul Olympic Sports Promotion Foundation."
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