splice: Black has one eye in the corner. threatens to capture
and kill the eye there.
captures the white stone but White extends to
and Black has one false eye and one real one. Dead.
Playing is wrong. It leaves
in atari, which is promptly captured by Black. Black makes a second eye and lives.
Would this work? You take away one of Black's eyes, and also have a net to run him into?
unkx80: This will work too.
victim: But it will give B an extra ko threat. The first solution is better.
There is a ko threat for Black at 'a', with 'b' being the best reply (capturing the two black stones might permit the cycle to start again.)
Again there is a ko threat at 'a' getting the reply at 'b'. Actually, even if White ignores the ko threat and doesn't play 'b', the best Black can do is capture the two white stones on the edge which, with a throw-in, leads to a false eye.
So the latter diagram isn't even one threat for Black. Thus surely White should prefer this one.
Shaydwyrm: Black can get extra ko threats by playing this way instead of as in the "What About This?" diagram. Now a is a threat (b is the response), and cutting also becomes a threat, maybe a real one rather than just a ko threat depending on the outside situation.