Ruleset Ko Rule Suicide ======= ======= ======= Japanese Ko Illegal Korean Ko Illegal Chinese Positional Superko Illegal AGA Situational Superko Illegal Ing Positional Superko Legal for groups with 2+ stones New Zealand Situational Superko Legal Tromp-Taylor Positional Superko Legal Ruleset Scoring Method Counting Method ======= ============== =============== Japanese Territory Territory Korean Territory Territory Chinese Area Area AGA Area or Territory Area Ing Fill-In Area New Zealand Area Area Tromp-Taylor Area Area Ruleset Compensation Points Seki Scoring ======= =================== ============ Japanese 6.5 Eyes in seki do not count Korean 6.5 Eyes in seki do not count Chinese 7.5 Eyes in seki count AGA 7.5, extra for handicap Eyes in seki count Ing 8, black wins ties Eyes in seki count New Zealand 7 Eyes in seki count Tromp-Taylor 7 Eyes in seki count Ruleset Handicap Rules Additional Rules ======= ============== ================ Japanese Fixed placement None Korean Fixed placement None Chinese Fixed or free placement None AGA Fixed or free placement Pass stones, white moves last Ing Free placement None New Zealand Free placement None Tromp-Taylor Free placement None Ko rule: A player may not recreate the previous board position. Original superko rule (aka positional superko): A player may not recreate any previous board position. Situational superko: A player may not recreate any previous board position with the same player to move. Fill-In Scoring: Each player has exactly 180 stones, at the end of the game they fill in their territories in turn until only one player has unfilled territories remaining on the board; that player wins by the number of unfilled territories remaining. Pass stone rule: When a player passes, he hands over a "pass stone" to his opponent to be treated as a prisoner. This helps make territory and area scoring mathematically equivalent. White moves last: White must make the last move, generally that means if White passes first and Black passes immediately afterward, players agree on the status of groups first then White must hand another stone over for his second pass. This ensures both players make the same number of moves and helps make territory and area scoring mathematically equivalent. AGA Handicap Compensation: In AGA rules, White recieves 1 additional point of compensation for every handicap stone placed on the board except for the first.