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KanazawaProblem85

 

Kanazawa Solution 85
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    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 at 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't 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 the upper side this way or ...


[Diagram]
Variation at 2

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



See also:



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