@Brain Sheppard Thanks that is a really useful explanation! the way you state: "and therefore a 8192-sized pattern set will identify all potential nakade." seems to indicate this is a known pattern set? could i find some more information on it somewhere? also i was unable to find Pebbles, is it open source?
@Robert Jasiek what definitions/papers/publications are you referring to? m.v.g. Roel On 24 January 2017 at 12:57, Brian Sheppard via Computer-go < computer-go@computer-go.org> wrote: > There are two issues: one is the shape and the other is the policy that > the search should follow. > > Of course the vital point is a killing move whether or not a group was > just captured. So it is possible to detect such shapes on the board and > then play the vital point. > > It is an entirely different thing to say when a rollout should look for > such features. Rollouts are complicated; playing the "best" play does not > always make your search engine stronger. Of course, there is a question of > the time required for analysis. And then there is the question of "balance". > > "Balance" means that the rollout should play "equally well" for both > sides, with the goal that the terminal nodes of the rollout are accurate > evaluations of the leafs of the tree. If you incorporate all moves that > punish tactical errors then sometimes you can get unbalanced results > because you do not have rules that prevent tactical errors from happening. > > A common rule for nakade is to only check after a group is captured. The > point is that the vital point is otherwise not motivated by any heuristics, > whereas most other moves in capturing races are suggested by local > patterns. My understanding of Alpha Go's policy is that they were only > checking for nakade after captures. > > The "center of a group of three" rule is a separate issue. My recollection > is that this pattern should be checked after every move, and that was a > discovery by the Mogo team. > > Note that there are often subtle differences for your program compared to > the published papers. > > Best, > Brian > > -----Original Message----- > From: Computer-go [mailto:computer-go-boun...@computer-go.org] On Behalf > Of Gian-Carlo Pascutto > Sent: Tuesday, January 24, 2017 3:05 AM > To: computer-go@computer-go.org > Subject: Re: [Computer-go] AlphaGo rollout nakade patterns? > > On 23-01-17 20:10, Brian Sheppard via Computer-go wrote: > > only captures of up to 9 stones can be nakade. > > I don't really understand this. > > http://senseis.xmp.net/?StraightThree > > Both constructing this shape and playing the vital point are not captures. > How can you detect the nakade (and play at a in time) if you only check > captures? > > -- > GCP > _______________________________________________ > Computer-go mailing list > Computer-go@computer-go.org > http://computer-go.org/mailman/listinfo/computer-go > > _______________________________________________ > Computer-go mailing list > Computer-go@computer-go.org > http://computer-go.org/mailman/listinfo/computer-go >
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