kokiri I'm game. This is option a, and I think it's wrong. The reason being, that after the exchange of , , White playing at doesn't make an eye at . Black can play the sequence c-e to render the eye false. Thus I think that white should connect the other way (i.e. at b), to retain the option of making a (gote) eye at
Gresil Why would black play above instead of at ? It doesn't seem to serve any purpose.
kokiri - good point. I've got it back to front, but I think the point remains the same. If White plays as above, then he cannot come back (at a later stage of the game) and make an eye at , because of the sequence , , c, d, e. If White, however, connects directly at , then White still has the option of later making a gote eye with .