4463 enclosure 3-4 contact

  Difficulty: Advanced   Keywords: MiddleGame, Joseki
[Diagram]

3-4 contact play

This contact play W1 is a normal measure taken against the 4463 enclosure. Since the 3-3 invasion typically becomes ko, W1 is a simpler approach to take, though it means that Black can take a solid corner if he so chooses.

[Diagram]

Black's replies

In pro games, Black next at a to confine White to the corner is somewhat more popular than Black at b, to defend the corner territory and allow White room on the left side.

Charles Matthews


Variations

There are many variations here, Here are some of the more common ones. Usually, White plays the contact play to invade after Black has extended along the side. Otherwise, another approach is usually more appropriate.

[Diagram]

Continuation - Outside hane

Here is one possible continuation for the outside hane. If Black plays at a, White will usually respond at b to secure the corner.

jwaytogo

tderz Black will rather start with b to threaten to initiate a ko (esp. if [circled point] is occupied by a BC).

jwaytogo Ahh, I knew I was missing something, probably more correct to say that if Black plays at [circled point], then white will usually defend at b. Thanks for the assistance, tderz!

E.g. Mingren,12,China,Zhongxing Telecom,

  Round     2, league
  Black     Chang Hao, 9 dan
  White     Wang Yuhui, 6 dan   (sorry that's with an ogeima)

Event 6th Gosei title

  Round     Preliminary round
  Black     Hisai Keishi, 9 dan
  White     Asano Hideaki, 5 dan

That would be the perfect example game sequence:

 Event     Fujitsu Cup,16,Japan,Fujitsu
  Round     3, Quarter final, 2
  Black     Lee ChangHo?, 9p (plays at "b")
  White     O Rissei, 9p
  Komi     6.5
  Date     2003-06-07
  Place     Japan
  Result     B+4.5

The ko does not appear, rather an intersting other option Event Oteai

  Black     Inoue Kunio, 6 dan  (plays at "b")
  White     Kosugi Masaru, 6 dan
  Komi     0
  Date     1982-06-30
  Place     Nihon Kiin, Tokyo, Japan
  Result     B+8

Event 13th Meijin title

  Round    league, 21
  Black    Iwamoto Kaoru, 9 dan   (plays at "b")
  White    Honda Kunihisa, 9 dan
  Komi     5
  Date     1974-05-22,23
  Place     Japan
  Result     W+12
 Black     Lee Changho, 3 dan
  White    Kim Hee-chong, 7 dan   (plays at "b")
  Komi     5.5
  Date     1989-03-07
  Place    Korea
  Result   B+R
[Diagram]

Eye stealing tesuji with lots of aji

[Diagram]

Eye stealing tesuji with lots of aji

[Diagram]

Eye stealing tesuji with lots of aji

tderz: the ko ...

[Diagram]

Continuation - Inside hane

Here is one possible continuation for the inside hane. Sometimes, White may exchange a for b before extending to 4, or White may play directly at c instead of 4 to get a lighter shape. It all depends on the surrounding stones.

jwaytogo


This is a copy of the living page "4463 enclosure 3-4 contact" at Sensei's Library.
(OC) 2005 the Authors, published under the OpenContent License V1.0.
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