Lesson 146: Patterns with Double-Approach 2
Most popular josekis being played in the 21st century are so big that they occupy about a quarter of a Baduk board. The variations initiated by the double-approach we're going to study in this lesson are no exception.
We already studied the sequence from White 1 to 15 in the last lesson. Nowadays, most top players play White 1 instead of coming into the corner at 2 because they know that Black's playing at 1 against White's 3-3 is a very forceful move. After Black 2, the sequence up to 15 is inevitable for both. However, it is not easy for Black to decide where to play after White 15. The two main choices are A and B.
If Black chooses A in Diag.1, the sequence up to 13 can be easily expected. The difficult part of this choice is the unforeseeable fights that may be started by White 14, which White will usually play right after Black 13.
The sequence from 2 to 8 is an example of the various fights after White 1. It is almost impossible to describe all the variations following Black 8, but it is certain that all of them are very difficult for both sides.
Black's bending at 1 means that he wants to make a ko with 13. Of course, what matters in every ko is the number of ko threats. But, you know, this is a joseki variation, which happens in the very beginning of a game most of the times. Therefore, let's assume that there is no other ko threat for either player but the local ones. Black has a ko threat at B against White's capture at A.
However, White also has an ace up his sleeve. As he comes out with 3, the number of White's ko threats becomes uncountable, so that Black cannot go on with the ko fight. Hence, Black ends the ko by capturing the three white stones with 4, and White captures two black stones with 5. The outcome up to 5 is quite satisfactory for both.
It is too much for Black to continue the ko with 2. After White takes back the ko with 9, Black has no ko threat to keep on playing the ko anyway.
It is also possible for White to answer against Black 1 with 2 because Black has to play one more move with 5 in order to make the ko direct. White cannot answer Black 7 since there will be no ko threat for him which can stop Black from capturing the eight white stones in the corner. The reason why White let Black capture the four white stones with 11 is that he wants to take a sente and play 12 on the upper side. Although White's territory on the left side is smaller than the one in Diag.6, this result seems a bit more favorable to White as he can save the three isolated white stones on the upper side with 12.
The writer is a baduk professor at Myongji University and a professional player of the game.