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4-4 point low approach large low extension
Difficulty: Advanced
Keywords: Opening, Joseki
This answer It has been making something of a comeback in the twenty-first. The ideas involved are different from those with the other extension responses. White takes into account that Black might take a big corner with one more play here. White a is therefore played early. Otherwise White b is reasonable; tenuki is also a major option. White at c was the old Chinese play, now effectively obsolete.
In this case the slide with White 1 isn't seen in high-level play[1]. With the black extension stone on the marked point, Black's stones are more efficiently placed. What was acceptable to White when Black's extension was to a is here unacceptable.
In many recent games the 3-3 invasion has gone this way. Black plays 6 to deny White's hane, rather than at a.
It could be that both players are satisfied with this kind of result. The marked white stone is weak but not closely confined. One related place where the slide is seen:
This has been, well, an orthodox development of the orthodox fuseki over recent years. White slides at
In fact it is normal for Black to invade at
White is presumably happy with this result. White's strong group makes up for Black's efficient left corner; because the right corner is a loose formation and White knows that she will fight there in the future. (This result was seen in a game Yi Se-tol vs. Seo Pong-su.) This interpretation is a manifestation of a basic principle of framework theory: it is an advantage to build a strong group on the edge of the opponent's framework. This is a copy of the living page "4-4 point low approach large low extension" at Sensei's Library. ![]() |