About Ko in a Semeai Between
Two One-Eyed Groups (2012)
[ The Construction Process
Makes the Difference ]
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///: The construction process makes the difference, i.e. the second ko-shape loses a shared liberty, compared to the larger eye. The moves from |
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In this diagram, the moves from You will realize that here is one shared liberty more ( |
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A move pair ( |
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(Referenced by ... will reduce Black's group with the second ko-shape in the centre to seven effective liberties (resulting in the need of Here, Black needs one ko-threat less than with the larger eye, making up for the loss of the internal ko-threats, he has there. So, with both basic shapes, Black needs three "external" (i.e. outside his eye) ko-threats, but has only two available in the problem. Both basic shapes are equivalent! |

to
, displayed in the diagram, are the relevant ones for building the basic shape of the second ko in the centre.
are relevant for building the basic shape of Black's larger eye.
) than with the second ko-shape above.
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) that reduces Black's group with the larger eye to eight effective liberties (resulting in the need of
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1159
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