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Square Nine in the Corner
Path: LifeAndDeath · Prev: GunEight · Next: SixDieButEightLive Square nine in the corner is related to the carpenter's square. 1. No outside liberties
When there are no outside liberties, White can turn this into sente seki. The vital point (obviously) is 'a'.
2 and 3 are miai. Black 6 avoids White starting an approach ko at 'a'. KarlKnechtel: Coincidentally, I was studying this eyespace earlier today with a friend on LGS?...
This way avoids the approach ko as well. Note that black cannot resist white's attempt later by filling the ko in response to the approach:
Now black's eyespace is AlmostFilled with a BulkyFive, and black dies.
This becomes seki too, but if Black omits 6, the ko started at 6 is slightly more advantageous for Black in that he can capture first.
Black 4 here is not so good, as it invites a two stage ko?.
This variation also becomes seki, but White ens in gote.
Black trying to avoid seki by taking away the eye is NO good idea because it becomes seki anyway and Black takes gote too.
2. One outside liberty
With one outside liberty the same main line applies, except that White must play gote at 7 to make it seki.
3. Two or more outside liberties
With two or more outside liberties, the attempt to make seki fails. White 1-7 can better be held in reserve as ko-threats. Path: LifeAndDeath · Prev: GunEight · Next: SixDieButEightLive This is a copy of the living page "Square Nine in the Corner" at Sensei's Library. (C) the Authors, published under the OpenContent License V1.0. |