364463 enclosure 3-3 invasion
As black has played 3 moves on the corner he will generally aim to kill a white invasion. An example where B tried to kill occurred in game 4 of the 2003 Kisei match Yamashita Keigo-O Rissei (B) (colours reversed). After the 3-3 invasion ,
here was played, which is a textbook attempt to kill.
Without the stone white can expect a ko for life in the related 4-4 6-3 enclosure.
Yamashita, however, challenged his opponent to kill him, playing ,
, and
. O Rissei then resigned, leaving us with a reading problem, given the exact placing of nearby stones.
Here is the position in the game with surrounding stones.
It is the positioning of the stone that causes some killing lines starting like White a, Black b, White c to fail. It would be nice to have some pro-level analysis of that, though.
JeanPierreTavan? :
Here is Alexandre Dinerchtein's analysis for this position.
The problem begin when white block at instead of
in the previous diagram.