Gokyo Shumyo, Section 1, Problem 66 / Solution

[Diagram]

Solution 1

B1 is the traditional solution. After W2, B3 is the only defense. White can block at a, atari at b, and hane at c in sente.

[Diagram]

Variation

Alternatively, White may immediately play at W2 and thrust at W4 to leave Black with two points. Compared to above, this tradeoff means that a and b are no longer sente for White.

[Diagram]

Black Failure at B3 (i)

If B3, White can make ko.

[Diagram]

Black Failure at B3 (ii)

W4 is double atari.


[Diagram]

Solution 2

B1 lives with more points by maximizing eyespace at the cost of creating more ko threats for the opponent.

[Diagram]

Variation

Immediate throw-in W2 doesn't work: Black is alive.

[Diagram]

Variation

However, Black must be careful not to capture with B3.

[Diagram]

inferior defense

After W2, B3 is inferior; W4 reduces Black territory (B5 at W6 is met by W6 at a).


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