lightvector
[Question] Is it possible to calculate partial territory scores from ownership for Japanese rule?
Hi.
kaorahi san's LizGoban nicely calculates and shows partial area scores from ownership information.
I am interested in this functionality for Japanese rule, about territories. Just removing stone parts from LizGoban algorithm seems to overestimate scores.
What do you guys, who are reading this issue, think about it? Is it possible?
GNU Go has a GTP extend command can calculate territory, in this command, the "wall" of every part territory is 0, the dead stone is 2, other is 1. Although it is a whole board command, you can turn it into part board command by easy program. http://www.gnu.org/software/gnugo/gnugo_19.html#SEC200 initial_influence: Return information about the initial influence function. Arguments: color to move, what information Fails: never Returns: Influence data formatted like:
0.51 1.34 3.20 6.60 9.09 8.06 1.96 0.00 0.00 0.45 1.65 4.92 12.19 17.47 15.92 4.03 0.00 0.00 . . . 0.00 0.00 0.00 0.00 0.00 100.00 75.53 41.47 23.41
The available choices of information are:
white_influence (float) black_influence (float) white_strength (float) black_strength (float) white_attenuation (float) black_attenuation (float) white_permeability (float) black_permeability (float) territory_value (float) influence_regions (int) non_territory (int)
The encoding of influence_regions is as follows: 4 white stone 3 white territory 2 white moyo 1 white area 0 neutral -1 black area -2 black moyo -3 black territory -4 black stone
How about excluding "boundary" grids? A grid is assumed as a "boundary" if, around it, there is another grid whose ownership has the opposite sign.
(not tested at all) https://github.com/kaorahi/lizgoban/tree/territory_210825b
Though it still overestimates the territory as it counts false eyes...
Partial scores are bogus anyway. So I show the difference between "the sum of partial scores" and "Katago's score estimation" on the top right corner as "+n".
@kaorahi If a go game end after all endgame moves, will the difference be zero?
No. After the endgame, "+n" shows the difference of captured stones between black and white typically.