[Bug-gnubg] Suggestion for change of rates/ratings

[Christian Anthon]

Hi all,

it is well known that gnubg judges the players harder than snowie.
Snowie error rates seems to be defacto standard when judging players. To
see how gnubg and snowie error rates compare I tried downloading 25 or
so matches from Hardye's site, all played between more or less world
class players and most of them quite long. They were analysed using
gnubg 2ply/2ply.

To summarise:

snowie_m  snowie_c   snowie  gnubg_m  gnubg_c   gnubg
    3.91      1.66     5.58     9.36    21.51   11.25

So given these numbers I suggest that we adapt snowie's rate/rating
groupings, but that we divide the gnubg move-error and total-error rates
with 2 and the cube error rate by 4. That way it will be easy for people
to understand the numbers and to compare an intermediate snowie player
to an intermediate gnubg player. Of course the move ratings and the
total ratings of gnubg will not be directly comparable. But it will
complicate things unnecessary to make it any different.

The ratios, if not the numbers is supported by some 400 3 point matches
and a few moneygames I have played on TMG. 

Christian.

For your information:

1986_reno_r16_robertie-magriel.mat
1987_reno_r16_robertie-ballard.mat
1993americas_open_div_final_Sconyers-lechich.mat
1993mc_lc_semifinal_kagan-robertie.mat
1994fibs_woolsey-bagai.mat
1997st_moritz_winter_final_lumper-magriel.mat
1999nordic_sj_final_ballard-meyburg.mat
1999venice_final_tardieu-kazaross.mat
2000_las_vegas_fall-tournament_final_lidov-balbi.mat
2000mc_final_scalamandre-holm.mat
2000mc_granstedt-vetsch.mat
2000nordic_cons_heitmueller-johanni.mat
2001mc_round1_johanni-decultot.mat
2001mc_round3_tardieu-persson.mat
2001nordic_round2_johansen-woolsey.mat
2002mc_final_ziva-andersen.mat
2002paris_round1_magriel-assaraf.mat
2003mc_final_royset-tissona.mat
2003mc_semifinal_royset-svendsen.mat
2004abudhabi_final_humke-idsoe.mat
2004mc_r32_hallberg-mcneil.mat
2004nordic_final_bloxham-lenz.mat
2005mc_finale_granstedt-holm.mat
2005mc_round2_jonas-tardieu.mat
2005nordic_cons_r32_friberg-tardieu.mat
2005nordic_final_salo-bredahl.mat
Anthon - cheeesy 9089525.mat