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BQM144
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Dieter: the following analysis can be found at 3-4 point high approach outside contact, tsukehiki hanging connection


[Diagram]
The ko

White has the possibility of starting a ko by playing at a, however she should not embark on this ko lightly. If White loses the ko, her position will crumble. If Black feels a need to remove the threat of the ko, he exchanges Black b for White c.



Now the question:

[Diagram]
Increasing the ko value

If the ko is so troublesome for Black, then White should be in a position to increase its value by playing W2 instead of a.

I assume that now Black can force White into a heavy position, as follows:


[Diagram]
Increasing the ko value

Black has now played two moves more than White. Is White's position unbearably heavy ?


[Diagram]
Variation

White can play this way too and get a good result, IMHO. So, the question remains why White would play lightly as suggested with c in the first diagram.



unkx80: I am not 100% sure, but allow me to make a suggestion using the following two diagrams. Remember in either case, Black takes the ko first.

[Diagram]
When White loses the ko I

[Diagram]
When White loses the ko II

Dieter; That sure could be a reason. So if I understand correctly, White's move doesn't increase her gain from the ko as much as it increases Black's.

unkx80: Yes.



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