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Throw-in ko
Difficulty: Beginner Keywords: EndGame, Ko
In the endgame Black can start a ko here, likely to be profitable since it is a picnic ko from Black's standpoint.[1] First Black plays
Then Black plays
Black has a follow-up at a which is substantial, once Black has captured to win the ko (marked stone). If White just connects at a Black has of course taken profit in sente here (and then can return to answer White's threat).
Simply playing
Black makes a throw-in at
[1] Bill: Whether this is a picnic ko or not is debatable. It is true that White will have a harder time winning the ko than Black, because it is a sente ko. (Black's winning the ko is a mild sente.) I am not sure if that is enough to qualify this as a picnic ko. Charles Looking at what is written at picnic ko and sente ko, I take this to be a sente ko (sense 1); which is called there an extreme case of picnic ko. But Bill comments on the picnic ko page that a true picnic ko results from a tenuki.
Bill: To the best of my knowledge, I was the one to coin the term sente ko some years ago. But since it is just the combination of two common terms, I do not feel that I am the arbiter of its usage. :-) However, I was surprised to hear it called an extreme form of picnic ko.
(White's last play is circled.)
Now This is a copy of the living page "Throw-in ko" at Sensei's Library. ![]() |