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KanazawaSolutions

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KanazawaProblem85

 

KanazawaSolution85
Path: KanazawaSolutions   · Prev: KanazawaSolution84   · Next: KanazawaSolution86
    Keywords: Problem

Main line & variations: unkx80, Dieter

Solution

The solution of this problem relies on the rule that a board position can not be repeated.

[Diagram]
Main line

Black 1 threatens to connect along the upper side (see variations). Then he threatens to make a living shape with 3, forcing White 4. Follows the awkward play at 5, needed to prevent a deadly bulky five. White must capture to prevent a lively bent four.


[Diagram]
Main line (ctd)

Black 7 recaptures, recreating an earlier board position. White would like to play ay a BUT she is not allowed. Can someone explain why Black can do it and white can't. Probably has something to do with the difference between positional ko and superpositional ko ...


[Diagram]
Variation at 4

What if White makes the Bulky five nonetheless. Isn' this ko ? No, it isn't: Black has two outside liberties, enabling him to atari all White's stones. If White connects at the marked spot with 8 instead, she creates a living 7 point eyespace inside Black's group.


[Diagram]
Variation at 2

If White prevents the situation at the side, Black connects along te upper side this way or ...


[Diagram]
Variation at 2

... this way, making miai of a and b.



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(OC) 2004 the Authors, published under the OpenContent License V1.0.