Keks: I understand the sequence q1, o2,o3. But why does o1 follow? If instead o1 enemy plays p1 I will have to follow with o1 because else my enemy would play o1 so he can kill with bulky five. But if i play o1 this is tenthousand year ko and it doesent favour me.
caranthir: No, we can have oshi-tsubushi and live with points because of outside liberties. ... P1O1, and now if N1, then Q2. With one less outside liberty, it would be direct ko, not mannen-ko. -- In the accepted answer, O1 is for enforcing sente seki, which is the strongest response.
No, we can have oshi-tsubushi and live with points because of outside liberties. ... P1 O1, and now if N1, then Q2. With one less outside liberty, it would be direct ko, not mannen-ko. -- In the accepted answer, O1 is for enforcing sente seki, which is the strongest response.