Seki Example 4

    Keywords: Life & Death, Problem
[Diagram]

muchen1999 [4d] vs. TheCaptain [4d] 2009-03-25

This was a game between TheCaptain (black) and muchen1999. As usual with TheCaptain's games, a complicated series of capturing races and ko fights ensued, and in this case, led to the marked sekis.

B2 in response to W1 was a mistake. It was not necessary to maintain the seki and cost black one point in the form of a prisoner (Japanese rules). Black lost the game by just half a point.

[ext] http://files.gokgs.com/games/2009/3/26/muchen1999-TheCaptain.sgf




For those of you who are wondering why B2 was a mistake, here's why.

[Diagram]

White can't start a ko (B2 = tenuki, B6 captures)

There is no ko in the lower right corner because Black can always respond to W3 with B4 (which is a double atari).


This is a copy of the living page "Seki Example 4" at Sensei's Library.
(OC) 2011 the Authors, published under the OpenContent License V1.0.
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