Re: Opening problems for AI: Problem 40
Posted: Mon Dec 26, 2022 8:40 am
by dhu163
Speculatively:
Current position:
1. The upper left looks very important when W has high stones around as B could be attacked but if B is strong then B can undercut W. So E18 stands out though W can still live with C15, so it remains a little awkward. But F16 becomes misplaced if B plays C18, so I think B must play from the upper side. If B follows up on the left, there is neither much space nor opportunity to counterattack as W is just the right distance away. Hence, B prefers to leave it unsettled, expecting to get a portion even if W plays first.
2. C3 is always interesting.
3. I can't think what else is good. P17, F18, O3, C9.
Opp to play
1. C15 is the obvious point.
Past:
1. Both D11 and L16 are misplaced when B can live, and B should live cleanly when the left, upper side, corner, centre all remain open. This is clearly better for B surely.
Check:
1. I got this wrong. It turns out the corner is more important when you are under attack. The potential to make a 1 space extension on the left remains big. In the suggested variation, W's upper side remains misplaced when W is crawling to live on the upper side already. I thought B's shape wasn't good, but actually, it is connected and still threatening W.
Current position:
1. The upper left looks very important when W has high stones around as B could be attacked but if B is strong then B can undercut W. So E18 stands out though W can still live with C15, so it remains a little awkward. But F16 becomes misplaced if B plays C18, so I think B must play from the upper side. If B follows up on the left, there is neither much space nor opportunity to counterattack as W is just the right distance away. Hence, B prefers to leave it unsettled, expecting to get a portion even if W plays first.
2. C3 is always interesting.
3. I can't think what else is good. P17, F18, O3, C9.
Opp to play
1. C15 is the obvious point.
Past:
1. Both D11 and L16 are misplaced when B can live, and B should live cleanly when the left, upper side, corner, centre all remain open. This is clearly better for B surely.
Check:
1. I got this wrong. It turns out the corner is more important when you are under attack. The potential to make a 1 space extension on the left remains big. In the suggested variation, W's upper side remains misplaced when W is crawling to live on the upper side already. I thought B's shape wasn't good, but actually, it is connected and still threatening W.