Igo Online

【Game 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 differenceHandicap
    KomiReverse komi
    06.5
    10
    213
    326
    439
    552
    665
    778
    891
    9104
    10117
    11130
    12143
    13156
    14169
    15182
    16195
    17208
    18221
    19234
    20247
    21260
    22273
    23286
    24299
    25312
    26325
    27338
    28351
    29360.5
    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 tapping (or 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 differenceHandicap gameEven 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.
    Abbr.Meaning
    RHRank match and Handicap game
    RERank match and Even game
    FHFree match and Handicap game
    FEFree 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.
territories
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.
    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".
    ko
  3. If you cannot take opponent's stones, you cannot move to the place where your stones are taken.
    The place where your stones are taken
  4. Stones which have two eyes are not taken.
    Stones which have two eyes
  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".
    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.
    pass
  7. After the judgment of territories started, stones which cannot make two eyes are removed as taken stones.
    taken stones

【Game name】

Igo Online

【Version】


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