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Large Avalanche Turn Outward
Path: LargeAvalanche · Prev: LargeAvalancheClamp · Next: LargeAvalancheTurnInward
Difficulty: Dan level
Keywords: Joseki
After Black 1, the moves to White 6 are considered the best continuation, although there is some variation possible, especially for White 4. After this, Black has to choose whether to save or sacrifice his three stones. Jonathan Cano: I've created a problem for a non-joseki variation on White 4, at Large Avalanche Turn Outward Problem. The problem begins with White 4 at 5.
Nowadays, Black 1 is considered the joseki move. Black allows White to take his three stones and the corner, making influence in return. The sequence to 5 is the current joseki. Some minor variations are possible: White might forgo the atari at 4 and play at 6 directly, while Black might exchange a for White b before playing 7. The exchange of a for b used to be the basic joseki, but nowadays it is most often left unplayed, because Black wants to keep the option open of forcing with c rather than a.
If White plays 2 here, Black will switch plans and take the corner.
Unfortunately I have no commentaries on this ensuing sequence, and I am not strong enough to give them myself. Anyone?
Black 1 is also a possibility. If White answers at a, the black group is alive (and thus the corner captured), but White b and White c are both sente. It is however more likely that White will immediately counter-attack with 2.
Saving the black stones with 1, rather than sacrificing them with 8, used to be joseki.
This used to be a popular joseki around 1950. Nowadays the fact that Black has to play two moves (1 and 3) to capture the corner is regarded too large a disadvantage.
Black 1 seemed to improve on Black 6, allowing Black to take the corner with one move, until the counter-measure of White 4 was discovered.
This is considered good for White because Black still has to take the three stones off the board. So Black's territory is rather small, while White has been able to play on both sides. If Black plays 3 at a, White can create a ko, while if Black does not play 5, White plays at b and Black dies outright.
If White plays 4 in the main diagram at 1 here, White can capture the three stones whatever happens. However, this gives Black too much thickness (note that Black a next makes a ponnuki in sente). Authors:
Path: LargeAvalanche · Prev: LargeAvalancheClamp · Next: LargeAvalancheTurnInward This is a copy of the living page "Large Avalanche Turn Outward" at Sensei's Library. ![]() |