Pandanet Top page

Pandanet Top page

Internet 13x13 Amateur World Go Championship

[ Final Rounds ]

If you click your class, you can see players and your results.

Main Class l  A Class l  B Class l 

Click here for detailed explanation of Final Rounds

[ Preliminary Rounds ]

If you click your class, you can see players and your results.

Main Class l  A Class l  B Class

Click to rules in the preliminary round.

Tournament Outline

Organizer: Pandanet Inc.
Special cooperation: Kansai Kiin


There are three categories. One is the Main Class and the others are Ranked Classes.

・Main Class (You can participate in the Main Class regardless of your Go strength.)
・ A Class (2k – 2d)
・ B Class (3k –)

*Players who wish to participate in A or B Class and who have not had their rank confirmed by Pandanet need to play at least 20 games on a 19x19 board to confirm their rating by May 22.
If a question mark appears next to the rank, it means the rank has not been officially confirmed by Pandanet.
*Players who have not had their rank confirmed by the due date will au tomatically be entered in the preliminary for the Main Class.
*All games in the Main Class will be played on even, so a ranking is not necessary.
*If you are 3d or above, your class will automatically be Main Class.

*Classes will be decided based on players' ranks as of 6 a.m., May 22.

<Playing Rules>

Time allowance The time allowance is 1 minute per side, with overtime of 25 moves every 15 minutes
Preliminary Rounds Participants play freely at least six games in their Class room during the Preliminary Rounds. (Participants are not allowed to play the same person twice.)

The ranking is determined by points in descending order.
The top eight players from each class proceed to the Final Rounds.

1. Points = W / N + W * 0.02
(W = number of wins, N = number of games played.)
2. With tied points, the player with the higher number of wins is ranked higher.
3. With tied points and wins, the player with the higher SOS (sum of opponents' scores) is ranked higher.
4. With tied points, wins and SOS, the players are ranked equal.
Click here for details
Final Rounds In the Final Rounds, single eliminations are played until a champion is determined.
The organizer conducts the drawing of lots to decide pairings.
Click here for details

On the tournament day, games will be played within the specified time at the time agreed to by both players and will be conducted in the specified room. Regarding the dates and times for Final Round games, please contact your opponents directly on the 'Net social plaza' page. In principle, please use Japan Standard Time (JST) when deciding the dates and times. *NOTE: JST=GMT+9.
Playing Conditions:
Main ClassAll games are played on even, with Black giving a komi of 6.5 point.
color: Colors are determined by the system automatically
A - B Class
in rank
0Black gives a komi of 6.5
0.5The weaker player (Black) gives a komi of 3.5
1The weaker player (Black) gives a komi of 0.5
1.5The stronger player (White) gives a komi of 2.5
2The stronger player (White) gives a komi of 5.5
2.5The stronger player (White) gives a komi of 8.5
3The stronger player (White) gives a komi of 11.5
3.5The stronger player (White) gives a komi of 14.5
4The stronger player (White) gives a komi of 17.5
4.5The stronger player (White) gives a komi of 20.5
5The stronger player (White) gives a komi of 23.5
5.5 -The stronger player (White) gives a komi of 26.5

*With a difference of 5.5 ranks or more,
the komi will be the same for all games (26.5 points).


Apr 17 (Mon) - May 14 (Sun)  Registration
May 27(Sat) - June 11(Sun)  Preliminary Rounds
June 26 (Mon) - July 16(Sun)  Final Rounds
  Main Class (Tue) A - B Class
June 16 (Fri) Playing pairings will be update on the Pandanet web site
June 26 (Mon)- July 2 (Sun) quarterfinals -
July 3 (Mon)- July 9 (Sun) semifinals
July 10 (Mon)- July 16 (Sun) finals

<Requirements for Participation>

  • Participant must be an amateur Go player.
  • Participant must be able to communicate by email in English.
  • Players in the BC (beginner class) are not allowed to participate.
  • All games are to be played on Pandanet.


  • All games must be exclusively played on the Pandanet server. Please use Pandanet's official client, GoPanda2 or Panda-Tetsuki. (Panda-Tetsuki is for iOS and android.)
  • Please play in the official Pandanet tournament room.
  • Please play games by yourself. Taking advice from a third person, or playing by a third person, is against the rules.
  • In principle, your games should be played from your home. Please let the organizer know in advance in case you want to play at location other than your home, such as a Go club where many people gather. The organizer may check the origin of your Internet connection.
  • If you lower your rank intentionally by losing games before the tournament, you will not be allowed to participate.
  • Please exchange greetings when starting and finishing your games. Insulting comments are strictly prohibited. If you are treated impolitely, please let the organizers know.
  • Please resign the game if you think there is no hope of winning, instead of dragging out the game.
  • Likewise, please don't tell your opponent to resign, even if your opponent is clearly losing. However, please let the organizers know if your opponent keeps playing useless moves and does not finish the game.
  • If the organizers finds out that you have violated the rules, you may be disqualified, even if the game result has been confirmed.
  • With players who keep winning and who keep rising in strength, there may in some cases be players who are disqualified on the grounds that their exact rank cannot be judged.
  • Also, players may be disqualified when there is an obvious disparity between their registered rank and their real strength.
  • If it is confirmed that you are using Go software, you will be disqualified from this tournmanent and forbidden to participate in all other tournaments.

<Participation Fee>

Free of charge


Main Class

Winner 1. Right to play a game with Hirofumi Ohashi 6-dan (13x13 Net game)
2. JPY 20,000
Runner-up JPY 10,000
3rd - 4th Prizes equivalent to 5,000 yen in value
5th - 8th Prizes equivalent to 3,000 yen in value

A - B Class

Winner JPY 10,000
Runner-up Prizes equivalent to 5,000 yen in value
3rd - 4th Prizes equivalent to 3,000 yen in value

Lottery prize Prizes equivalent to 1,000 yen in value (10 people)

Page Top