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Real Half Point Ko
Path: SecondCourseOnKo · Prev: HalfPointKo · Next: HonKo
Keywords: Ko
This ko, commonly known as a half point ko, has a miai value of only 1/3.
However, this ko really does have a miai value of 1/2. :-)
White 2 elsewhere, Black 3 fills.
Result: 0. A difference of two moves makes a difference of one point, so the miai value of the ko is 1/2.
White 3 - Black 4 = ko threat and reply. White 5 takes the ko back. Black 6 elsewhere. White 7 at 2. Result: -1.
White 2 elsewhere. White 4 - Black 5 = ko threat and reply. White 6 takes ko back. Black 7 elsewhere. White 8 at 3.
Result: 0.
Again, a difference of two plays makes a difference of one point. Miai value of ko = 1/2. When Black is komaster the ko has a miai value of 7/12.
White 1 fills, leaving a 1/2 point play at a.
White 4 takes ko. Black 5 - White 6 = ko threat and reply. Black 7 at 1.
Result: +2/3. (Black has taken one stone for one point, minus 1/3 point for the black stone in ko.)
After Black 1 the local temperature drops to 1/3. Black has a sente sequence with Black 3 - White 8.
Two plays make a difference of 1/2 + 2/3 = 7/6 points. The miai value of the ko is 7/12. -- Bill Spight Path: SecondCourseOnKo · Prev: HalfPointKo · Next: HonKo This is a copy of the living page "Real Half Point Ko" at Sensei's Library. ![]() |