No, for an eye to be false, the opponent must control at least 50% of the diagonal points (2 on a center intersection, and 1 for a side or corner intersection). In your case, both are real eyes.
Living with two false eyes occur when you surround a living group of the opponent, and only have two false eyes. This page explains it a lot better: http://senseis.xmp.net/?TwoHeadedDragon Date: Sun, 27 Mar 2011 14:27:12 -0400 From: [email protected] To: [email protected] Subject: Re: [Computer-go] UCT parameters and application to other games It doesn't seem as rare as you are saying. Maybe I don't understand the exact definition of "living by two false eyes". Does this count? ________ |.XXO. |X.XO. |XXOO. |OOO.. |..... That is not a rare situation. Plus, tree search will find more strange situations that you will find in a game. And playouts will find more strage situations that you will find in the tree. On Sun, Mar 27, 2011 at 12:25 PM, Aja <[email protected]> wrote: > As attached, if you are considering such case of "living by two false eyes", > it might be good to solve it by some special rules. But I doubt it ever > appeared in any game in the history. Otherwise, I think "don't fill real > eye" and "filling false eye is allowed" should be promising for the MC > playouts. > > BTW, I am Aja, not the famous MC program Aya. :) > > Aja > > ----- Original Message ----- > From: Daniel Shawul > To: Aja ; [email protected] > Sent: Sunday, March 27, 2011 8:19 PM > Subject: Re: [Computer-go] UCT parameters and application to other games > Hi Joona > Thanks for the description. If a simple eye detection such as that > works , then it should accelerate the MC playouts very much. > I will try it. > To Aya : I am afraid not. I am majorly a chess programmer trying my hands > on Go since a couple of months. > regards, > Daniel > > On Sun, Mar 27, 2011 at 3:38 AM, Aja <[email protected]> wrote: >> >> Hi Daniel, >>  >> Are you the one that talked with me (ajahuang) in KGS? If yes, then I can >> understand what you meant about "double eyes", but I doubt it ever >> happened in any 9x9 game in the history.... >>  >> Aja >> >> ----- Original Message ----- >> From: Daniel Shawul >> To: [email protected] >> Sent: Sunday, March 27, 2011 1:44 AM >> Subject: Re: [Computer-go] UCT parameters and application to other games >> Ok I will do that. It has already started performing really well after I >> allowed >> the full lenght playouts though. This was I think a major problem earlier. >> Especially in the endgame it is outplaying the alpha-beta searcher. >> Thank you all for your suggestions. >> >> On Sat, Mar 26, 2011 at 1:19 PM, Michael Williams >> <[email protected]> wrote: >>> >>> You need to prevent it from filling any real eye.  Regardless of how >>> many eyes the given chain has.  I cannot tell if that is what you are >>> doing or not. >>> >>> >>> On Sat, Mar 26, 2011 at 1:05 PM, Daniel Shawul <[email protected]> wrote: >>> > Well you said single eye which make it a suicide move. It will not >>> > fill its >>> > single eye! >>> > But to prevent filling one of the double eyes, I need to have to code >>> > to >>> > detect real double eyes from false eyes. >>> > I do not do that right now. May be I will just exclude any move which >>> > reduces us to a single eye. >>> > That should take care of it I guess. >>> > >>> > On Sat, Mar 26, 2011 at 12:57 PM, Christoph Birk >>> > <[email protected]> wrote: >>> >> >>> >> On Mar 26, 2011, at 9:54 AM, Daniel Shawul wrote: >>> >> >>> >>> As I already said before, I _do_ prevent filling of single eyes >>> >>> (suicide >>> >>> moves). I thought you guys were talking about >>> >> >>> >> We are talking about your own eyes (not suicide) >>> >> >>> >> Christoph >>> >> >>> >> _______________________________________________ >>> >> Computer-go mailing list >>> >> [email protected] >>> >> http://dvandva.org/cgi-bin/mailman/listinfo/computer-go >>> > >>> > >>> > _______________________________________________ >>> > Computer-go mailing list >>> > [email protected] >>> > http://dvandva.org/cgi-bin/mailman/listinfo/computer-go >>> > >>> _______________________________________________ >>> Computer-go mailing list >>> [email protected] >>> http://dvandva.org/cgi-bin/mailman/listinfo/computer-go >> >> ________________________________ >> >> _______________________________________________ >> Computer-go mailing list >> [email protected] >> http://dvandva.org/cgi-bin/mailman/listinfo/computer-go >> >> _______________________________________________ >> Computer-go mailing list >> [email protected] >> http://dvandva.org/cgi-bin/mailman/listinfo/computer-go > > > _______________________________________________ > Computer-go mailing list > [email protected] > http://dvandva.org/cgi-bin/mailman/listinfo/computer-go > _______________________________________________ Computer-go mailing list [email protected] http://dvandva.org/cgi-bin/mailman/listinfo/computer-go
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