BeginnerExercise136/Solution

Sub-page of BeginnerExercise136
[Diagram]

Solution (W5 at W1)

White first plays throw-in W1 and W3. If Black defends the right, White takes the left ko first. And...

[Diagram]

Solution (W9 at W5)

If Black defends the left with B4, White starts another throw-in ko in the right and use the left ko capture W7 as a ko threat. This is a kind of double ko and Black can't fight the left ko using outside ko threats because White can always use the other ko capture as a ko threat - so B8 is forced. Then W9 effectively takes the right ko first.


[Diagram]

Tactically inferior

W1 here makes throw-ins at B2 and W3 miai to start a ko. This is tactically inferior because Black takes the ko first. On the other hand, this may work as a strategic probe: White asks "Which side do you defend?" and chooses strategy depending on Black's answer, keeping the option of starting a ko later.

[Diagram]

Clearly worse (B4 at W1)

The other throw-in first is a mistake. This is even worse than the diagram above in two respects: 1) Black has 1 extra point (prisoner), and 2) Black can resolve the ko by capturing at a.



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