mgoetze: With a throw-in, white can set up a double ko in which she will definitely capture something. Whenever Black plays a, White can play ; if Black ever plays b, White will be able to capture at c or d.
Rich: If Black captures with b, d would be an illegal move...
mgoetze: Oh... mumbles something about sleep deprivation... well, uhm, at least it will be a good source of ko threats.
unkx80: The moves can be considered correct. To nitpick a bit, can be played more profitably at a.
There is an alternative solution below, which may be better:
White plays , then a and b are miai. One good thing about this is that White does not have to sacrifice any stones prior to
.
In mgoetze's diagram, if is played at
, then White's loss when losing the ko is to the extent of
. This will not happen in the solution diagram.
Back to Beginner Exercise 136.
Onward to Beginner Exercise 137.