![]() StartingPoints Paths Referenced by Homepages
|
Invading an Enclosure
Path: EnclosureTechniques · Prev: TheSmallLowEnclosureIsSecure · Next: DefendingAnEnclosure Path: InvasionItinerary · Prev: Uchikomi · Next: InvasionsOnTheSide
Keywords: MiddleGame, Joseki, Tactics
It is not recommended that you invade an enclosure (shimari) before you get strong on the outside. But with a strong position in the center and in the case when the influence Black gets is not going to help much, go for an invasion.
Here's something I remember from my first series of Go articles I read a quarter of a century ago.
But it is quite thin and if the surroundings are favourable, White has a possibility to cut and make a fight of it.
If
TDerz If White is considered very strong[1] at the outside, Black could also consider this move for defending (see sabaki for a continuation). I did a little bit of pattern searching on Jan's incredible database at
These first three show the White kosumi-tesuji continuation on the 2-2 point: (1) Takagawa Kaku (B) vs. Kitani Minoru 1963-12; (2) Takagawa Kaku (B) vs. Kitani Minoru, 1964, 19th Honinbo League, Round 5; (3) Hotta Seiji vs. Hiroe Hiroyuki, 1990-02-22, 31st Okan,31, Japan, Round 2. In the first two games Black is very, very strong on the outside - very different from the diagrams up here where White is strong - and White uses the 5-5 shimari reducing move first, i.e. before the displayed moves. Similar but a little bit less strong is the Black position in the third game. (4) Ishida Atsushi (7p) vs. Kawamura Kazunori (8p), 22nd Tengen title, Prelim. rd. 1, game 11, 1996-03-07 is the only professional game which had a part of the upper position in actual play. This could mean that it is playable :-) (5) Go Seigen, 3 dan vs. White Sekiyama Riichi, 4 dan, Oteai, 1930-04-02,03 in Round 5 (of 8) of spring session of the Nihon Ki-in Rating Tournament is one game with the position of the above ko diagram. (6) 13th Japan-China Go Exchange, Round 1, Ma Xiaochun 9p vs. Ishida Akira 9p, 1985-05-28 shows one game where ko is avoided (Black was very strong in the shimari environment) and a different fight results.
[1] This way of playing seems more appropriate if Black, not White, is strong and has stones around the side-hoshis. See for example part 9 of Charles Matthews excellent 'Setpiece Kos' series. There, move 2 above leads to an interesting ko (colors reversed). In the next diagram you can see that the whole situation could also appear starting with
White will have played already a and b before starting to move into the corner.
All positions where White connects solidly are ones where White already has the circled or at least the squared peeping stone. White's options are thus cutting or living. White is strong in the surroundings and these moves therefore appear quite late in the games, much later than in the above examples. -- Tommie? Dieter: I think this is not correct: Black will connect at a and White can only make an [L+1-group] with b. Next, Black kills playing c. TDerz: Sloppy of me. Then I should better only state that the solid connection appears in professional games, e.g. no. (6) above and be silent about the reasons why they played it. If Black connects at a, then Black can be cut at d. If Black were connecting both at a and d, White could also play two moves b and e needed for living. As said above, the strong surroundings make the difference and this certainly cannot be generalized. It is fighting and can only be read out.
This
It's because
I'd say it has more to do with playing
TDerz The 2nd-line kosumi puzzled me. Would this one space extension,
I prefer
The difference seems to be that in the case of
The circled exchange could also happen without the stone
Bill: I confess to being flabbergasted by the discussion of the kosumi to the second line and the one space extension. Not by the plays, which may be best under certain circumstances, but by the diagrams showing them, in which they are almost certainly horrible plays.
This is a common way of strengthening the corner. It is also questionable in this context <sigh>, but better.
Is there already a page for sequences starting from here= Path: EnclosureTechniques · Prev: TheSmallLowEnclosureIsSecure · Next: DefendingAnEnclosure Path: InvasionItinerary · Prev: Uchikomi · Next: InvasionsOnTheSide This is a copy of the living page "Invading an Enclosure" at Sensei's Library. ![]() |