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Enclosure Opening
Path: EnclosureTechniques · Prev: AllowingTwoEnclosures · Next: OrthodoxFuseki
Difficulty: Advanced Keywords: Opening
Opening pattern along one side in which Black's third [3] move (move 5,
Black plays at the marked point to create a good territorial formation. This opening became very popular in the first decade of komi Go.[4]
It developed partly because White's second move (
When White approaches low in the right-hand corner,
This continuation became settled theory (
When White makes the high approach here, Black at a is the usual play. The pincer at b will turn out well for White if the correct variation is chosen (on the page about this pincer apply the ladder-dependent variation in 2.1.1). The pincer at c is played sometimes in high-level games, but Black must seek complications to gain advantage from it.
This is the position after the main variation of the pincer at ''c''. White ends in gote but can regard plays in the directions of the two marked points as being nearly miai for a follow-up.
Yes, assuming a white 4-4 point in the lower right, as we're looking at it, Black next at b is recommended (if I recall correctly) by Go Seigen and Yang Yilun; while Black at a is also played. In a sense we should read this backwards: taking into account White's formation, Black should anticipate this standard outcome when playing the initial pincer. If White had a 3-3 point lower right, Black would perhaps be less worried about a fight on the right side. Charles Matthews
The nadare has been tried many times by pros. An interesting idea (Cho Chikun in 1972) in the application of the traditional ''onadare'' main line was to replace a by
The classic pattern here is, however, with this standard joseki. Black takes sente, having secured both corners. Black at a is a checking extension setting up an invasion at c, which is therefore very big; Black at a or White at b will be played soon.
A surprising idea that must have been born out of professionals' dissatisfaction with that result is to play chrisg I found this in Kombilo whilst playing through an old game of mine, and was quite surprised by it. The continuations I found had continuations with 'a' through 'c' marked, 'a' seemed to end up in a sequence with a ladder to the bottom right, where B plays a ladder breaker, 'b' seemed to revert to the standard fuseki, with the exception of the exchange. I can't really say much about 'c' though.
Here is the variation that ends in a ladder, starting at
An innovation of Takemiya was to play for central influence by making the solid connection with
An idea from Kitani Minoru in the late 1950s is for White to play a wedge on the side instead. White 1 is the point chosen in pro games: none of a, b or c is seen. After This way of playing has been adopted from time to time by top players, so is presumably reasonable considering komi, to simplify the game. For more advanced discussion see the enclosure opening files. [1] See enclosure opening distant low approach, pincer for discussion of an interesting less-used pattern. [2] Much less common are the enclosure opening-style sides based on enclosures using the 3-5 point. These are discussed on the 3554 enclosure, 3555 enclosure and 3564 enclosure pages. The analogues for 4-4 point, 3-3 point and 5-4 point enclosures of this side pattern are all rare: enclosing the right corner would normally take priority. [3] Bill: What about those openings where Black's second move is an enclosure? They are enclosure openings, too.
Charles Quite true:
It does tend though to become a tasuki fuseki: often enough it can transpose into the regulation fuseki or the analogue with a 4-3 point not a 3-4 point lower left. In fact I guess it became popular mainly because Black expected to play
Bill: According to Takagawa, the enclosure of the top right corner with
Charles If it is the 4-3 point, rather, then
Given the theory of the time, I think White might have felt she's achieved something already here. That is, Black at either of the circle or square points is playing into an opposite komoku. Which (to this day, it seems) pros avoid.
Therefore Black would presumably play takamoku or mokuhazushi lower left (at that time); and White doesn't feel so far behind on territory. larsen: Well, I suppose Black can do quite well playing a straightforward hoshi in the given position. It makes miai of approaching either komoku, and the high approach supported by hoshi tends to be quite pleasant to play. Just a fuseki by-way. But the old guys put a huge effort into these nuances - something one picks up. [4] The board has been rotated 90 degrees counter clockwise for convenience. Path: EnclosureTechniques · Prev: AllowingTwoEnclosures · Next: OrthodoxFuseki This is a copy of the living page "Enclosure Opening" at Sensei's Library. ![]() |