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 handicap (komi) of even game is 6.5. If the rank difference is 1, the komi is 0. If the rank difference is 2 and over, the reverse komi is increased by 13 each or the stone is increased by 1 each.
    Rank differenceHandicap
    KomiReverse komiStone
    06.5
    10
    2132
    3263
    4394
    5525
    6656
    7787
    8918
    91049
    1011710
    1113011
    1214312
    1315613
    1416914
    1518215
    1619516
    1720817
    1822118
    1923419
    2024720
    2126021
    2227322
    2328623
    2429924
    2531225
    2632526
    2733827
    2835128
    29360.529
    360.529
  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】

When getting started, you can start with 19x19 board of full size or 9x9 board of mini size. It is your preference. If you start with 9x9 board, please use the robot match of “Mini Go Online”. It will be good to start with 30K and move to 19x19 board around 25K.

Go is a game that competes for the number of territories. The intersection of a line and a line is counted as “1”. In the figure below, black territories are 60 and white territories are 50. It is added 6.5 komi (handicap) to White of second move, and the result is Black wins by 3.5. If you take opponent's stones during the match, the number of stones is subtracted from the opponent's territories. For example, if White took 4 black stones, black territories will be 56 and white territories will be 50. Adding komi, it will be White wins by 0.5.
territories

You can take by blocking all the top, bottom, left and right of opponent's stones. In addition, the state that can be taken by one more move is called “atari”.
take

Places of “×” are surrounded by white stones, and when Black moves, own stones are taken. You cannot move to places such as this.
Places where you cannot move

Places of “・” are also surrounded by white stones, but Black can take opponent's stones. You can move to places such as this.
Places where you can move

If it returns to the same shape, it cannot be taken back immediately after it is taken. This state is called “ko”.
ko

There are shapes that can never be taken. There are two eyes.
Shapes that can never be taken

If Black or White move to places of “・”, own stones become “atari”, so they cannot move. This state is called “seki”.
seki

Please fill in all spaces such as “・” that between black territories and white territories, and confirm the border of territories. The judgment of territories is started by both passes.
pass

Stones such as “◎” remaining in opponent's territories are treated as taken stones. It is not necessary to take during the match.
Stones remaining in opponent's territories

It is introduction of the basic way of thinking of opening preparation. First, nine black points on Go board are called “star points”. These are used as guides for preparation, and also these are places to place stones in handicap games.
Star points of Go board

In most cases, first 4 moves are moved to 4 corners. In addition, they are moved as the figure below.
First 4 moves

After the 5th move, there are various choices. You can move near opponent's stones to wait and see, or move near own stones to strengthen, or move around star points on empty sides to expand territories. The figure below is an example of wait-and-see and strengthening.
An example of wait-and-see and strengthening

Lines of Go board are called “1st line” “2nd line” from the outside. Good places for opening preparation are “3rd line” “4th line”. If you move to “1st line” “2nd line”, they will be few territories. In addition, if you move more than “5th line”, they will be difficult to consolidate a territory.
Lines of Go board

There are efficient places to make territories. The figure below shows same size territories made in the corner, side and center, but the number of stones used is different. The corner with the fewest number of stones is the most efficient. The side is next, and the center is last.
Same size territories made in the corner, side and center

【Game name】

Igo Online

【Version】


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