Joachim's Ko-Semeai - Putting the Cart
Before the Horse (2013 - 2015)
A Decisive "Late" Moment
: 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 for occupying Black's hanezeki-directed liberty, the Punishment Semeai Liberty Level is seven. Before White captured the ko, Black's group had eight liberties. Please note that the concurrence of larger Black eye in the centre, and ko-shape on the right, provides Black with an approach-move liberty at k. 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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