This seemingly innocent sequence contains a mistake. can be improved due to the presence of the marked Black stone:
This one is correct.
An example of this line of play can be seen at move 135 of game 4 of the 9th Kisei match played on 21, 22 February 1985 between Takemiya Masaki and Cho Chikun.
The result to be expected is as follows:
After the exchange /
, playing on with
at
would be gote for White.
Hence Black can expect to get the sequence to
in sente. This is two points better for Black than in the original diagram.
One final question is whether in the first diagram becomes a mistake, given the good reply at
, or whether hane is better. It is close, but
is still a little better.
-- dnerra
Bill: Is the sagari better than the hane for White?
That's not an easy question. The difference game suggests that sometimes one is right, sometimes the other. That's not unusual with medium sized yose. :-)
I have spent a little time on this, and it seems to me (assuming that Black's sagari is sente), that hane by White may be able to gain one point in circumstances that will hardly ever arise.
Surely Black will get his sente in first. ;-)