[gnugo-devel] Influence calculation

[SP LEE]

Below is the situation I posted in
http://mail.gnu.org/archive/html/gnugo-devel/2003-09/msg00000.html (move
49).

   A B C D E F G H J K L M N O P Q R S T
19 . . . . . . . . . . . . . . . . . . . 19
18 . . . . O X X . . . . . . . . . O . . 18
17 . . . . O O X . . . X . O . O . O X . 17
16 . . O + . . X . . + . . . . . O X . . 16
15 . . . . . . . . . . . . . . . . X . . 15
14 . . . . . . . . . O . . . . . . . . . 14
13 . . . . O . O . . . . . . . . . . . . 13
12 . . O . . . . . . O . . . . . X . . . 12
11 . X O O X . . . . . . . . . . . . . . 11
10 . O X O . X . . X + . . . . . + . . . 10
 9 . X X . . . . . . . . . . . . . X . . 9
 8 . . . . . . . . . . . . . . . . . . . 8
 7 . . X . . . X . . . . . . . . . . . . 7
 6 . . . . . O . . . . . . . . O . X . . 6
 5 . . . . . . . . . . . . . . . . . . . 5
 4 . . . + . X . X . X . . . . . O . O . 4
 3 . . . X . . . . . . . . . O . . . . . 3
 2 . . . . . . . . . O . . . . . . . . . 2
 1 . . . . . . . . . . . . . . . . . . . 1
   A B C D E F G H J K L M N O P Q R S T

After I used the "influence" command in gtp mode, I got the following
influence graph.

 3  3  3  3  2  0 -1 -2 -2 -2  0  0  1  3  3  3  3  3  3
 3  3  3  3  @  X  X -2 -2 -2 -1  0  2  3  3  3  @  0 -1
 3  3  3  3  @  @  X -2 -1 -1  X  0  @  3  @  3  @  X -3
 3  3  @  2  2  0  X -1  0  0  0  0  2  2  2  @  X -3 -3
 3  2  2  2  2  0  0  0  0  1  1  1  2  2  1  0  X -3 -3
 2  2  2  2  2  2  1  1  2  @  2  2  2  1  0  0 -2 -3 -3
 2  2  2  2  @  3  @  3  3  3  2  2  1  0  0 -1 -3 -3 -3
 1  0  @  3  0  0  0  0  1  @  2  2  1  0  0  X -3 -3 -3
 0  X  @  @  X -1  0  0  0  0  1  1  0  0  0 -2 -3 -3 -3
-2  @  X  @  0  X -3 -3  X  0  0  0  0  0  0 -1 -2 -3 -3
-3  X  X  0  0 -1 -3 -2 -2 -1  0  0  0  0  0 -1  X -3 -1
-3 -3 -3 -1  0 -1 -2 -2 -2 -1  0  0  0  0  0  0 -1 -2  0
-3 -3  X -2 -1 -2  X -2 -2 -1  0  0  1  1  1  0 -1 -1  0
-3 -3 -2 -2 -2  @ -2 -2 -2 -1  0  0  1  2  @  0  X  0  0
-3 -3 -2 -2 -2 -2 -3 -2 -2 -2  0  0  1  2  3  2  0  0  1
-3 -2 -2 -2 -2  X -3  X -1  X  0  0  1  2  3  @  3  @  2
-3 -3 -2  X -3 -3 -2 -1  0  0  0  1  2  @  3  3  3  3  3
-3 -3 -3 -3 -3 -2 -1  0  0  @  2  2  2  2  3  3  3  3  3
-3 -3 -3 -3 -3 -1  0  0  1  2  2  2  2  2  3  3  3  3  3

I'm not very clear of the influence calculation, but I think it is
rather inappropriate to mark the 4 0's around D9. Either these positions
should be somewhat influenced by white or there should be more 0's to
mark non-territory for either colors. It lets me recall the method of
calculation posted by Phil in
http://mail.gnu.org/archive/html/gnugo-devel/2003-07/msg00268.html. I
really appreciate if Phil can check the attached game at move 49.

Furthermore I think there is no need for deep reading here. We only need
a calculation method to find a wide enough openning of a territory for
intrusion, or at least to try intrusion.

SP Lee


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