Lonestar: If Black answers at , White gets one eye with
. The second eye White gets by the capture of the marked black stones.
If Black answers at , White gets two eyes at the bottom with a play at
or a.
HolIgor: Which move is better? or a?
Lonestar: Maybe a is better?!
This is better for White, because if Black plays at a, White does not need to answer, or White has the follow-up at a??
unkx80: The play at a is better, for both the reasons you just stated.