定石 研究 part 1

基本图

For this fuseki, white usually responds with either A or B.

图1

Earlier this year, this 定石 variation occurred with high frequency.

黑: 李昌镐 白: 姜东润 富士通杯决赛 2009-07-06

After 白20 定石, 黑 extension at A is quite big and severe.

Since this original version, many newer variations have been experimented.

基本图2

黑13 & 白14 exchange precludes white from pressing at Q12.

黑: 金志锡 白: 李昌镐 2009-08-19

黄翊祖 commented that 白22 is a bit heavy maybe should play Q8 instead. On his game on tygem, 崔哲瀚 (showmethe) agrees with this point of view.

黑23 defends against white from settling down with 白33. 白24 good sequence before white blocks at 白26; it creates 白32 which helps white escape outward with 白34 & 白36.

基本图3

白12 presses then 白14 扳 is the latest version.

黑15 is what white hopes.

Comparsion Picture:

Compare to original version (right), triangle black seed (left) is not as well placed. Left corner has much more aiji than the original version.

To be continue.....