Mef: I think black is dead
Black doesn't have enough time to save both eyes here, so white will take one either with or by playing should black neglect it.
is forced, because black will immediately live by playing it. A, B and C all look miai to keep black dead
Shaydwyrm: here is another interesting move I considered, but it looks like kills.
Willerz: above is wrong -- this makes a and b miai -- Black a makes 2 eyes. Black b makes a seki. So Black can live. White can kill by starting at a.
Shaydwyrm: is incorrect, leaves white with no followup.
Shaydwyrm: This is not seki. White can fill black's outside liberties and then play A & B to put black in atari.
Willerz: Shaydwyrm is right, however I think this makes a and b miai. So Black can live. White can kill by starting at a.
Shaydwyrm: Check the diagram labeled "White 2 at A" above for why white can't kill by starting at A.
Shaydwyrm: Aha, but I have considered this as well! forces (in a sense, though black should really tenuki instead of all of these since he's dead), and then the situation is the same as the not-seki above.
WillerZ: White a and we're back to where we were just now.
unkx80: Referring to Alternative A, how is this?
Shaydwyrm: Looks like black has a 2 step ko, since he needs an approach move at a. He should not play his approach move at b, since that gives white a local threat at c. White can play at , then black , white b, black c for a seki if black is komaster.
Shaydwyrm: here also leads to ko, but it is direct.