lavalyn: Optimal for both players.
DamienSullivan: Can't go at
for the same result?
unkx80: No. Then at
kills.
Black catches two White stones in oiotoshi.
Isn't atari? Couldn't White just capture by playing
at a? -phooky
lavalyn: Yes, is atari. Thus
removes one of the white pieces surrounding the threatened group.
With White's stones isolated and the cut impossible, White's connection still yields only a bent four not in the corner.
hotcoffee: Umm... What about this - a ko doesn't seem inevitable?
is forced, as
at
is two eyes. Then black can play
at
, or to the right of
, for life. White can resist with
at a, but there is a snapback. White's best response is identical to the main line in the first diagram.
unkx80: Snapback, ya, but...
In this ko setup, isn't 5 played incorrectly?