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Ko Etymology Borrowing from Japanese 劫 (kō) Noun Edit ko (uncountable) Ko is a Japanese go term adopted into English usage. It describes a situation where two alternating single stone captures would repeat the original board position. The alternating captures could repeat indefinitely, preventing the game from ending. The ko rule resolves the situation. You much play elsewhere at least once before you can go back to the alternating capture patten. The other side in term, must also play somewhere else first before come back to this alternating capture fight. The term ko is also used more generally in reference to other repeating patterns and rules involving them, although superko is the general term for repetitions other than the take-and-take-back ko.
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