[Bug-gnubg] Weird luck based FIBs rating diff. ?!

[Massimiliano . Maini]

Hi all,


I've just played and anlyzed a match with the lastest cose (well, actually
yesterday's code), and I noticed something weird on the match stats.
The "Luck based FIBS rating diff." is an astonishing +12035.60 !!
I know gnubg plays better than me but ...

Is it a bug ? Is it due to the fact the luck adjustement actually
reverts the result (-50.0% --> +3.61%) ?

I have the analyzed sgf file is somebody is interested.


                                      gnubg                MaX
Chequer Play Statistics:
Total moves                            84                   83
Unforced moves                         78                   80
Unmarked moves                          0                    0
Moves marked good                      84                   80
Moves marked doubtful                   0                    1
Moves marked bad                        0                    2
Moves marked very bad                   0                    0
Error rate (total)                    +0.000               -0.536
( -8.213%)
Error rate (per move)                   +0.0                 -6.7
( -0.103%)
Chequerplay rating                    Supernatural         Expert

Luck Statistics:
Rolls marked very lucky                 1                    1
Rolls marked lucky                      5                    6
Rolls unmarked                         71                   72
Rolls marked unlucky                    6                    4
Rolls marked very unlucky               1                    0
Luck rate (total)                     -1.699 (-50.318%)    +2.035
( +3.291%)
Luck rate (per move)                   -20.2 ( -0.599%)     +24.5
( +0.040%)
Luck rating                           Better luck next time Good dice, man!

Cube Statistics:
Total cube decisions                   51                   60
Close or actual cube decisions         13                   20
Doubles                                 2                    5
Takes                                   1                    2
Passes                                  4                    0
Missed doubles (below CP)               0                    1 (-0.065
( -0.419%))
Missed doubles (above CP)               0                    0
Wrong doubles (below DP)                0                    0
Wrong doubles (above TG)                0                    0
Wrong takes                             0                    0
Wrong passes                            2 (-0.125 ( -0.801%))   0
Error rate (total)                    -0.125 ( -0.801%)    -0.065
( -0.419%)
Error rate (per cube decision)          -9.7 ( -0.062%)      -3.3
( -0.021%)
Cube decision rating                  Advanced             World class

Overall Statistics:
Error rate (total)                    -0.125 ( -0.801%)    -0.601
( -8.632%)
Error rate (per decision)               -1.4 ( -0.009%)      -6.0
( -0.086%)
Equiv. Snowie error rate                -0.8                 -3.6
Overall rating                        Supernatural         Expert
Actual result                          -50.00%              +50.00%
Luck adjusted result                    +3.61%               -3.61%
Luck based FIBS rating diff.          +12035.60
Error based abs. FIBS rating          2042.4               1964.1
Chequerplay errors rating loss           0.0                 83.4
Cube errors rating loss                  7.6                  2.6


MaX.