Joachim's Ko-Semeai - Putting the Cart
Before the Horse (2013 - 2015)
A Decisive "Late" Moment
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This position was chosen mainly for historical reasons, and second, because it seemed to be the most straightforward one for our explanations. |
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Due to White's earlier gote move Black has one ko-threat in the hanezeki, at |
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White's centre group has five liberties (2 * w, 3 * c). Black's group in the upper right has seven liberties (3 * b, 3 * c, k), and is so in danger to suffer from the Punishment Semeai. This tight conjunction with the Punishment Semeai seems to simplify several issues of the forthcoming ko-fight for White, and to make the moment, when White's group has five (effective) liberties left, the optimal one to start the ko. |

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233
before the completion of the hanezeki's tail (
/
) would limit White's options in the centre, turning the solid move at
into a mistake (
.
, instead of starting the ko with 
