4463 enclosure 3-4 contact
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.
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.
Here is one possible continuation for the outside hane. If Black plays at a, White will usually respond at b to secure the corner.
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
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.