Ko fight example from a pro game - 3
This is a game between Zhang Li and Huang Yizhong in 2005. White invites a ko with , which is necessary to fight the capturing race in the corner.
starts the ko.
is the first threat and it is a local ko threat.
is also a local threat. Next
-
prepares
which is necessary to continue the ko.
is another local threat.
Black throws in at , a tesuji that reminds of the two stone corner squeeze.
then takes the ko, which has become a two stage ko. Finally,
at
resolves the ko.
Tapir: Was
at
or at the spot marked in the diagram. Either move resolves the ko though.
Incidentally, the last local threat, at is worth a discussion:
If has resolved the ko, (below treatment can be cleaned up a little)
tderz: I think is good (even better).
The normal White a threatens the same and also involves .
I wonder whether one could say that one is better than the other.
tderz: [1] ,
and
are miai - if
at
, then
.
White wins the semeai by 2 moves AND the ko at
x is still good aji for white (bad for black).
In the game Black got two moves in the upper left corner instead.
-
is a bad exchange - it loses one liberty.
tderz: White answers with to keep the nice ko aji in the corner. White wins by 2.