Joachim's Ko-Semeai - Putting the Cart
Before the Horse (2013 - 2015)
12a - White's "Standard" Move
on the Upper Edge
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She should avoid falling into the trap of simply answering with the sagari of |
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Black group has seven liberties (2 * c, 3 * b, k), so he needed the "usual" single (external) ko-threat to win the semeai. |
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By thoughtlessly playing the sagari of |
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Black lacks ko-threats outside the hanezeki. Therefore, due to Black's initial mistake with his hane at 4, White will win the ko-fight. |
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White has five liberties (2 * w, 3 * c) against seven liberties (3 * c, 3 * b, k) for Black. Black needed an external ko-threat (more than White) to win the game, but which he lacks now. |

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in the upper centre. White stops Black from establishing another ko-shape in this area (
1077
. The more restricted push of
from the left, instead, that is easier for White to handle, is a mistake.
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, instead, will not help either. Black will give atari from below, at
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) as already explained above.

, Black mistakenly plays from the left. The preparatory sequence results in a change in the order of moves with our "standard" procedure for Joachim's Ko-Semeai.

