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Three By Four Solution
   

[Diagram]
Diag.: Sacrifice for ko

Black throws in at 1 and 3, then connects with 5.


[Diagram]
Diag.: Ko

White has no defense.


[Diagram]
Diag.: Correct play (Japanese).

W 4 sagaris. W 6 is a throw in for damezumari.


[Diagram]
Diag.: Seki.

Black gets 2 points for the 2 prisoners.


[Diagram]
Diag.: Correct play (Chinese).

Black wins by 4.

Note that by stone counting, Black wins by 3 points either way. In the second diagram Black needs 1 (false) eye for life.



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