Hi,
Recently I have tried to use Japanese rule without one point safe margin.
I use Erik and Aja's method. It works pretty well, but this position is
still diffcult.
9....X.O..
8....X.O..
7....X.O.. Black("X") to play
6...XXOO.. komi is 6.5
5...X.O...
4...X.O...
3...X.O...
2...X.O...
1...X.O...
ABCDEFGHJ
(;GM[1]SZ[9]RE[B+0.5]KM[6.5]RU[Japanese]
;B[di];W[fi];B[dh];W[fh];B[dg];W[fg];B[df];W[ff];B[de];W[fe]
;B[dd];W[fd];B[ed];W[gd];B[ec];W[gc];B[eb];W[gb];B[ea];W[ga])
Best move is PASS or filling share liberties(F9,F8,F7,E5,E4,E3,E2,E1).
Aya can play it, but its winrate is around 0.50, far from understanding
this position is easy win for B.
Tentyo no Igo(commercial version of Zen) also returns around 0.50.
Is there good method that can return over 0.80 winrate?
I feel "Do playout and modify score by number of pass" is hard for B +0.5
win position. Because B has more territory about 7 pt, and W has bigger
chance to pass in playout. As a result, B winrate is lower than 0.50.
My code is like this.
if ( last_two_move_is_pass_in_tree ) { // confirmation phase
pass_w_playout = pass_b_playout = 0;
playout_length = 0;
}
game_length = record_length + tree_legth + playout_legnth;
pass_w = pass_w_record + pass_w_tree + pass_w_playout;
pass_b = pass_b_record + pass_b_tree + pass_b_playout;
Margin = 0;
if ( (game_length&1) ) {
if ( first_player_is_white ) Margin = -1;
else Margin = +1;
}
minus = (Margin + pass_w - pass_b);
japanese_score = chinese_score - minus;
double final_score = japanese_score - komi - handicaps;
Without confirmation phase, winrate drops from 0.50 to 0.45.
Aya does not grow tree after consecutive pass in tree. Maybe I need to grow?
But to do that, I need to have two root positions that have same hash value,
one is root, and the other is after onconsecutive pass.
Steenvreter's solution
http://dvandva.org/pipermail/computer-go/2010-April/000233.html
Erica's solution
http://computer-go.org/pipermail/computer-go/2013-February/005757.html
Many Faces' solution
http://dvandva.org/pipermail/computer-go/2013-February/005748.html
Useful link by Fuego team
http://sourceforge.net/apps/trac/fuego/wiki/JapaneseRules
Regards,
Hiroshi Yamashita
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