Re: [gnugo-devel] Opponent follow-up value and group connection

[SP LEE]

The following patch is to make GNUGO to treat bigger dragons more seriously.
I'm not experienced in making such patches, so please correct me if I'm
wrong.

--- gnugo/engine/value_moves.c 2003-05-12 12:08:30.000000000 -0700
+++ value_moves.c 2003-05-12 12:09:34.000000000 -0700
@@ -1767,7 +1767,16 @@
       if (move_reasons[r].type == OWL_ATTACK_MOVE
    || move_reasons[r].type == OWL_DEFEND_MOVE
    || move_reasons[r].type == SEMEAI_MOVE)
- this_value = 0.0;
+   {
+    /* For bigger dragon an extra weight is added */
+   if (this_value>16)
+   {
+    tot_value+=this_value;
+    TRACE("  %1m: -%f - owl attack/defense of big dragon %1m\n",
+     pos, this_value, aa);
+   }
+   this_value = 0.0;
+   }
       else if (move_reasons[r].type == OWL_ATTACK_MOVE_GOOD_KO
         || move_reasons[r].type == OWL_DEFEND_MOVE_GOOD_KO) {
  this_value *= 0.3;



----- Original Message -----
From: "SP LEE" <address@hidden>
To: <address@hidden>
Sent: Sunday, May 11, 2003 9:31 AM
Subject: Re: [gnugo-devel] Opponent follow-up value and group connection


> The solution to this problem might be simple, but it certainly has good or
> bad effect in general. If I have a group worth more than 15 points, I
would
> not trade it for something else easily. So we could double the "change in
> territory" value if it's greater than 15.
>
> I don't know if this is a good solution. Please comment.
>
>
> >From: Arend Bayer <address@hidden>
> >Reply-To: GNU Go development <address@hidden>
> >To: GNU Go development <address@hidden>
> >Subject: Re: [gnugo-devel] Opponent follow-up value and group connection
> >Date: Sun, 11 May 2003 15:05:57 +0200 (CEST)
> >
> >On Sat, 10 May 2003, SP LEE wrote:
> >
> > > Then at move 166, GNUGO played M6, letting the lower right corner
group
> >T7
> > > dead by white O6, losing about 30 points. It is interesting that the
owl
> > > analysis of T7 is completely correct. It said that T7 is dead if white
> >plays
> > > O6 and the defend of T7 is possible at O6.
> > >
> > > Below is the top moves GNUGO considered:
> > >
> > > Top moves:
> > > 1. M6  36.76
> > > 2. O6  36.11
> >
> > >
> > >   M6: owl attack/defend for L6
> > >   M6:   2.83 (followup) - threatens to capture M5
> > >   M6: 11.17 - change in territory
> > >   M6: 3.87 - strategic effect on L8
> > >   M6: 8.17 - strategic effect on N7
> > >   M6:   3.94 - L6 strategic value already counted - A.
> > >   M6: 8.04 - strategic effect on K5
> > >   M6:   2.83 - total followup value, added 0.00 as territorial
followup
> > >   M6: 1.42 - added due to followup (2.83) and reverse followup values
> >(0.00)
> > >   M6: 3.35 - shape (shape values +2.00(1) -0.00(0), shape factor
1.102)
> > >   M6: 0.74 - connects strings (connect value 7, shape factor 0.149)
> > > Move generation values M6 to 36.75
> > >
> > >   O6: owl attack/defend for T7
> > >   O6: 29.81 - change in territory
> > >   O6: 3.13 - strategic effect on N7
> > >   O6: 2.48 - strategic bonus for T7
> > >   O6:   4.33 - total followup value, added 4.33 as territorial
followup
> > >   O6: 2.16 - added due to followup (4.33) and reverse followup values
> >(0.00)
> > >   O6: -1.79 - shape (shape values +0.00(0) -1.00(1), shape factor
0.952)
> > >   O6: 0.31 - connects strings (connect value 3, shape factor 0.061)
> > > Move generation values O6 to 36.10
> >
> > > I would think if a group is dead and worth 30 points, GNUGO must
> >consider it
> > > seriously.
> >
> >Yes, the problem here is that the strategic valuations of M6 got a bit
> >confused. One problem is the dragon at K5. It can either connect to
> >H6 or to K9, and so M6 should get hardly any "strategic effect" bonus for
> >that.
> >
> >Also the shape values don't exactly help here.
> >
> >Arend
> >
> >
> >
> >
> >_______________________________________________
> >gnugo-devel mailing list
> >address@hidden
> >http://mail.gnu.org/mailman/listinfo/gnugo-devel
>
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