Joachim's Ko-Semeai - Putting the Cart
Before the Horse (2013 - 2015)
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FLAG 8a: ( Compared to main line (with a larger eye for Black, after White's move at FLAG 8a1: ( |
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FLAG 8a2: ( FLAG 8a3: ( |
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FLAG 8b: ( But Black must not do so, because White will win by double-ko. Please note that there is a precondition that Black needs to play a protective move in the upper left corner, to enable wholly approaching White's centre group. |
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FLAG 11: ( White's solid move at |

1036
to
is one option for construction.
, and Black's moves at
, and
), there will be no effect. Black will still need one external ko-threat. Compared to the smaller eye for Black alone, Black needs one external ko-threat less.
, before starting the ko.
, to create a smaller eye for Black. Unnecessarily, she would need an own ko-threat to win the game!
) has not been played already.
, resulting in an additional external ko on the upper edge.
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