Colossus 2007a: #21 Free Single-CPU engine in CCRL 40/4

[Kirill Kryukov]

A while ago I posted hopeful early results for Colossus 2007a. After more games it's rating stabilized at much lower point unfortunately. It now played 991 games in CCRL 40/4 testing, the resulting rating is 2654 ELO points, #21 in Free Single-CPU list.

CCRL 40/4: Free Single-CPU list (my version which includes only stable public releases with default settings).

Fragment of the list:

Code: Select all

  Rank           Engine            ELO   +    -   Score  AvOp  Games
    17 Pseudo 0.7c                2677  +12  -12  51.4%  -14.7  2455
    18 Ruffian 1.0.5              2675  +15  -15  49.3%   +6.0  1667
    19 Petir 4.39                 2670  +18  -18  43.9%  +45.0  1055
    20 Aristarch 4.50             2668  +13  -14  46.0%  +30.2  2025
>>> 21 Colossus 2007a             2654  +19  -19  40.3%  +69.7   991
    22 The Baron 1.8.1            2652  +21  -21  45.5%  +32.6   821
    23 Crafty 21.5 PS 64-bit      2650  +18  -18  41.7%  +60.3  1072
    24 Smarthink 0.17a            2648  +21  -21  46.0%  +27.3   766
    25 Jonny 2.83 32-bit          2646  +16  -16  42.3%  +58.9  1375

Still Colossus 2007a seems to be an improvement over 2006f, with 9 ELO points difference and LOS (Likelihood of Superiority) or 77.1%.

All results of Colossus 2007a

Comparison of Colossus versions we tested

Best,
Kirill