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

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.

Outside hane

Counter hane (3-4)

Counter hane on the second line

I find this variation once by Ma Xiaochun (winning) against Yoo Chang Hyuk in the Samsung Cup 2001, and by Nakamura Hidehito (losing) against Kono Rin in the 2007 Meijin Preliminary. In both cases there are other stones in the proximity - reducing the influence of the possible black wall reached by variation b.

tapir: Whites eyespace is somewhat dubious here...

tapir: Example from pro play, white has only 1,5 eyes locally.

tapir: this last one is simplified, that is decontextualized... please add scholarship here.

tapir: please take notice of the fact, that in all lines given until now, it is black to chose between taking outside influence or keeping the corner and the option to keep the corner is available even after the outside hane.

Crosscut

tapir: After the crosscut I can only find one stable (played more than once) line in my small database. Please help!

Dieter: Such a crosscut is never played in isolation but as an emergency tactic with other, more important stones involved. Two pro games had this much space around the crosscut, once as a ko threat and once as a ladder breaker so the context was even bigger!

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Variations (Old page)

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.

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 is occupied by a ).

jwaytogo Ahh, I knew I was missing something, probably more correct to say that if Black plays at , 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

tderz: the ko ...

jwaytogo

Is it not better for Black to confine White to the corner for influence, especially if he has side extensions to his orginal 4-4 6-3 corner enclosure?

tapir: What is this? Looks so strange and small. The professionals play (in my database invariably two lines, after ,,), s. Counter hane.

Yes I saw this in either enclosure joskies or ishida's joseki dictionary and I think it's outdated.