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Unusual Enclosures
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    Keywords: Opening

There are perhaps nine normal corner enclosures in go. The number of unorthodox ones that are sometimes seen is large (as many as 50), depending on quite what one allows. See shimari for initial discussion.

Suppose we interpret ABCD enclosure to mean the enclosure built from the A-B and C-D points in a corner. That means that 3453 enclosure is another name for the kogeima shimari, also known as the small knight's move enclosure. Correct Japanese would have this as kogeima-jimari, in fact; this phonetic change applies to the other enclosures too, but is less likely to be met in English-language texts.

evpsych: For a perhaps hard-to-follow-for-non-native-speakers rant on notations that contains an explanation of this notation, see StopTheNotationMadness.

[Diagram]
Diag.: 3453 enclosure


This has been the most orthodox enclosure for komi go.

Then the full list of usual enclosures, described in the same way, is

  1. 3354 enclosure
  2. 3364 enclosure
  3. 3453 enclosure, kogeima shimari
  4. 3454 enclosure, ikken shimari, one-point enclosure
  5. 3463 enclosure, ogeima shimari, large knight's move enclosure
  6. 4463 enclosure
  7. 4464 enclosure
  8. 4473 enclosure
  9. 4474 enclosure.
Dieter: Shouldn't this list be on the enclosure page ?
Charles Well, OK, let's reconsider this material. No one seems to object to my list of nine 'usual' enclosures. And (gradually) pages have been created for all of those. How many general pages do we need on enclosures? Half-a-dozen, anyway. The nomenclature is troublesome; there are general opening principles; there are reduction, invasion and probe techniques; usual enclosures; notes and links for unusual enclosures (two-stone and three-stone).

Of the less usual enclosures, the most popular are

Almost all unusual enclosures are centrally-oriented, because they are weak in the corner. The enclosures based on 4-4 points are influence-oriented, except the 4463 enclosure for which the 3-3 invasion lives only in ko.

Tight enclosures, aiming to take corner territory, are

The other classical enclosure is

The 3445 and 3446 enclosures are typical special techniques in the Chinese fuseki and mini-chinese, for positions in which 3454 wouldn't be ambitious enough.

Notes on less usual enclosures

3373 is a rare formation.

3374 is perhaps mid-way between an enclosure and an extension. It has been played by Seo Pong-su.

3464 is an O Meien experiment.

3465 was played by Suzuki Etsuo.

The 3473 enclosure is actually a move with a long history - Dosaku played it - normally played for reasons of fighting or balance on the side. O Meien has tried it.

Kato Masao has played 3474.

3483, played free-standing rather than in a kind of Chinese formation, is in fashion in 2002 with Yang Yi and Wang Lei.

Yi Ch'ang-ho has tried 3553 more than once.

The 3563 enclosure has been played by O Meien and also played by Zhou Heyang.

Recently O Meien has used the 3564 enclosure many times.

The 3583 enclosure was tried by Kamimura Kunio.

The Chinese enclosure 3493 has of course been given a great deal of attention in relation with the Chinese fuseki and its variants.

3584 has been played in recent times by Otake Hideo.

3594 was played in 1973 by Hashimoto Shoji.

The 35103 enclosure, if you could call it that, is quite common, relatively speaking; as is the 3593 enclosure.

Yang Keon has played 3663.

The nineteenth century player Takasaki Tainosuke experimented with 3683 and 4674.

Ma Xiaochun has played 4475 more than once.

Kamimura Kunio once played 4565. 4554 was an experiment of Yu Bin. 4573 was played by Ishida Yoshio in the Nihon Ki-in Championship match 1971.

The 45103 enclosure had an outing in eighteenth century go.


See also unusual three-stone enclosures



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This is a copy of the living page "Unusual Enclosures" at Sensei's Library.
(OC) 2003 the Authors, published under the OpenContent License V1.0.