Xuanxuan Qijing Problem 310 / Solution

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Traditional Solution: Kill

W11 at a and White makes a bulky five. B6 is weak. Instead...

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Panda Sensei analysis

B6 here and B8! leads to ko.

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Variation

W5 turn is a mistake. Black lives with B6.


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Another defense

Go Seigen claims B2 at a is weak and suggests this line: another ko. B10 at W5.

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Cont. 1

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Panda Sensei refutes

But B4 above is a mistake. After W8, Black loses the capturing race. Instead, B1 at W2, W6 or a leads to ko.


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Takagi 1

Takagi Shoichi solution 1: ko (This is correct)

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Takagi 2

Takagi Shoichi solution 2: ko (partly wrong. B6 at W9 is correct, leading to ko)

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Takagi 3

Takagi Shoichi solution 3: ko (wrong. W9 at B10 kills.)

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Cont. 1

(Note the similarities to the Go Seigen ko)


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All lead to ko

Panda Sensei shows many ways to make ko, W1 at a to e, with the marked stones added. Variations are complex....


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