Ko fight example from a pro game - 3

  Difficulty: Advanced   Keywords: Ko, Game commentary
[Diagram]

start of ko

This is a game between Zhang Li and Huang Yizhong in 2005 (complete game record: [ext] http://www.go4go.net/go/games/sgfview/8929). White invites a ko with W6, which is necessary to fight the capturing race in the corner. B9 starts the ko.

[Diagram]

B8 at C19

W1 is the first threat and it is a local ko threat. B4 is also a local threat. Next W5-B6 prepares W7 which is necessary to continue the ko. B9 is another local threat.

[Diagram]

B4 at black+circle, W7 at W1

B2 is a local threat and W3 must respond again. W9 seems to finish the ko, but ...

[Diagram]

W6 at white+circle

Black throws in at B1, a tesuji that reminds of the two stone corner squeeze. B3 then takes the ko, which has become a two stage ko. Finally, W8 resolves the ko.

Incidentally, the last local threat, at W4, is worth a discussion:

[Diagram]

Why is it a ko threat

If B1 resolved the ko, W2 connects. B3 cannot resist, as W4 makes miai of a and b. Probably W4 should be played at a immediately.


This is a copy of the living page "Ko fight example from a pro game - 3" at Sensei's Library.
(OC) 2016 the Authors, published under the OpenContent License V1.0.
[Welcome to Sensei's Library!]
StartingPoints
ReferenceSection
About