[Computer-go] Many Faces and Japanese rules

David Fotland fotland at smart-games.com
Sun May 2 23:51:30 PDT 2010

Many Faces also passes in both examples.

> -----Original Message-----
> From: computer-go-bounces at dvandva.org [mailto:computer-go-
> bounces at dvandva.org] On Behalf Of Erik van der Werf
> Sent: Monday, April 26, 2010 3:13 PM
> To: computer-go at dvandva.org
> Subject: Re: [Computer-go] Many Faces and Japanese rules
> On Mon, Apr 26, 2010 at 2:44 PM, Yamato <yamato_cg at yahoo.co.jp> wrote:
> > Aja wrote:
> >>Erica plays PASS (win rate=40%) with 200000 playouts. I wonder what
> is Zen's
> >>result?
> >
> > Great. The current version of Zen never plays pass in this situation.
> I just checked to be sure; Steenvreter correctly passes in both
> examples. I'm speculating, but I think your problem is that you only
> adjust for the difference between Japanese and Chinese counting in the
> playouts. However, once consecutive passing gets into the tree you
> have to correct earlier.
> The way I think of it Japanese rules have two phases: (1) the game
> phase and (2) the confirmation phase. In the game phase passing first
> can gain a point. In the confirmation phase it can not. The
> confirmation phase normally starts after 2 consecutive passes. If the
> confirmation phase has not started yet in the tree then the entire
> playout can be considered a confirmation phase.
> Erik
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