Igo Online

【Overview】

Go online free browser game. Go aka Igo/Baduk/Weiqi. Player vs player or computer, watching games. Japanese Go rule. No e-mail registration.

【How to play】

1. This game is based on the Japanese Go rule. (Text for inexperienced persons)
2. The default handicap (komi) is 6.5: Black gives to White in an even game.
   

   Rank difference	Handicap
   	Komi	Reverse komi
   0	6.5
   1	0
   2		13
   3		26
   4		39
   5		52
   6		65
   7		78
   8		91
   9		104
   10		117
   11		130
   12		143
   13		156
   14		169
   15		182
   16		195
   17		208
   18		221
   19		234
   20		247
   21		260
   22		273
   23		286
   24		299
   25		312
   26		325
   27		338
   28		351
   29		360.5
   ∞		360.5

3. An illegal point: foul defeat (9D-18K), warning dialog (19K-30K).
4. The match is stopped by both passes. "■" "□" are enabled territories, "×" "＋" are disabled territories. If the automatic judgment is wrong, please correct by clicking stones or territories on the board.
5. At rank match, players can rank up by points; 200 (8D-5D), 100 (4D-1D), 70 (1K-9K), 50 (10K-18K), 20 (19K-25K), 10 (26K-30K).
   

   Rank difference	Handicap game	Even game
   		Higher win	Lower win
   0	±10	±10	±10
   1	±10	±5	±15
   2	±10	±1	±19
   ∞	±10	±1	±19

6. Abbreviations used in the game.
   

   Abbreviation	Meaning
   RH	Rank match and Handicap game
   RE	Rank match and Even game
   FH	Free match and Handicap game
   FE	Free match and Even game

7. Please see also the Q&A.

【For inexperienced persons】

Go game competes for the number of territories (intersections). Black gives handicap (komi) 6.5 to White in an even game.

BlackTerritories: BlackIntersections－TakenBlackStones＝36－0＝36
WhiteTerritories: WhiteIntersections－TakenWhiteStones＝27－0＝27
SurfaceOfBoard: BlackTerritories－WhiteTerritories＝36－27＝9 (●Lead)
Result: SurfaceOfBoard－Handicap＝9－6.5＝2.5 (●Win)

1. You can take opponent's stones by surrounding.
   
2. You cannot move to the place which becomes same shape repetition. Once it is necessary to move to other places. This state is called "ko".
   
3. If you cannot take opponent's stones, you cannot move to the place where your stones are taken.
   
4. Stones which have two eyes are not taken.
   
5. Black and White cannot move to "・". Because even if you want to take opponent's stones, your stones are taken first. This state is called "seki".
   
6. If you have filled in all places that do not become a territory such as "・", please pass. The judgment of territories is started by both passes.
   
7. After the judgment of territories started, stones which cannot make two eyes are removed as taken stones.
   

【Game name】

Igo Online

【Version】