BQM 223
revo: This is from a KGS game between gassan(6d) and SuiYi?(4d) ( http://kgs.kiseido.com/games/2005/5/20/gassan-SuiYi.sgf Move #149).
My question is, is
there really so much better than the solid connection at a, that it's worth leaving a four point ko threat at b? (The threat is probably even bigger since it could completely kill the white corner). Maybe I should have shown a bigger part of the board, but let's assume white is shut in, so it's also a question of life and death. But I think, a would make life quite the same way, but without leaving a ko threat.
I see moves like this made very often by players of all strength. I play them myself frequently, because it looks like better shape. But if I look at this closely now, I think a would be a really better move. However, the 6d white didn't think so and I hope someone can explain why.
Thanks for your comments.