Xuanxuan Qijing Problem 310 / Solution
at a and White makes a bulky five.
is weak. Instead...
here and
! leads to ko.
turn is a mistake. Black lives with
.
Go Seigen claims
at a is weak and suggests this line: another ko.
at
.
Takagi Shoichi solution 2: ko (partly wrong.
at
is correct, leading to ko)
Takagi Shoichi solution 3: ko (wrong.
at
kills.)
(Note the similarities to the Go Seigen ko)
Panda Sensei shows many ways to make ko,
at a to e, with the marked stones added. Variations are complex....