Main line: Hashimoto Utaro
Variations: Bill Spight, Dieter
White plays on the leg side, on the second line. White lives up to . If next Black a...
White can play atari at and Black can't connect at
(oshitsubushi).
Bending in from the side without the leg leads to ko. If Black wins the ko, he almost fills White's eyespace with a bulky five. The points a and b are miai for that purpose, and thus serve as a ko-threat for White:
White'slocal ko threat
is a ko threat. If
fills the ko,
makes seki.
This is problematic:
If Black plays a, White captures to make a living big eye. If not, White makes seki at a. Let's discuss this at Kanazawa discussion 70.
White must win the ko to be able to approach at a.
Go to Problem 71
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