Here's an analysis of the first full board diagram discussion in Ishida & Davies' "Attack and Defense"
Attack & defense by Ishida and Davies reviewed with KataGo 1
-
Knotwilg
- Oza
- Posts: 2432
- Joined: Fri Jan 14, 2011 6:53 am
- Rank: KGS 2d OGS 1d Fox 4d
- GD Posts: 0
- KGS: Artevelde
- OGS: Knotwilg
- Online playing schedule: UTC 18:00 - 22:00
- Location: Ghent, Belgium
- Has thanked: 360 times
- Been thanked: 1021 times
- Contact:
-
Schachus
- Lives with ko
- Posts: 211
- Joined: Wed Jul 01, 2015 11:02 am
- Rank: KGS 1k EGF 2k
- GD Posts: 0
- KGS: Schachus12
- Has thanked: 16 times
- Been thanked: 62 times
Re: Attack & defense by Ishida and Davies reviewed with Kata
what komi did you use for katago/ what komi does this game have? I`m surprised black is supposed to be clearly ahead (unless it`s 0 komi then it doesnt surprise me).
-
Knotwilg
- Oza
- Posts: 2432
- Joined: Fri Jan 14, 2011 6:53 am
- Rank: KGS 2d OGS 1d Fox 4d
- GD Posts: 0
- KGS: Artevelde
- OGS: Knotwilg
- Online playing schedule: UTC 18:00 - 22:00
- Location: Ghent, Belgium
- Has thanked: 360 times
- Been thanked: 1021 times
- Contact:
Re: Attack & defense by Ishida and Davies reviewed with Kata
Me too I was surprised ... I used a 6,5 point komi.Schachus wrote:what komi did you use for katago/ what komi does this game have? I`m surprised black is supposed to be clearly ahead (unless it`s 0 komi then it doesnt surprise me).
To test whether my version of KataGo takes it into account, I changed komi to 0,5 ... and KataGo gives Black a 14 pt advantage. If it were strictly additive it should give 12 points but this shows it takes komi into account.
Edit: I also made two other changes to test the evaluation
1) I moved White's lower left 3-3 stone to 4-4. That seems to reduce Black's advantage from 6 to 4,5 (with error margins)
2) I replaced the upper left with (what used to be) the standard line of the large avalanche outward turn. That further reduces the advantage to 3,5. See below
Maybe having solid influence towards the opponent's lone corner is giving an advantage, if we compare both assessments.
As this wasn't the theme of this post I won't further investigate this now but if someone has a view on which effects compound into such a big lead early on, I'm also interested.