Tags give the ability to mark specific points in history as being important
  • v2.1.1_r216
    f9e6d305 · release v2.1.1 ·

    Zevra v2.1.1 r216

    Download: Zevra_v2.1.1_r216.zip

    Bug fix

    • Uci command go without arguments working
    • Fix compilation errors on some PCs on Linux
    • All compilation warnings fixed

    Code length: 3034 lines

  • v2.1_r210   Zevra v2.1 r210
    b5cde5cd · v2.1 release ·

    Zevra v2.1 r210

    Download: Zevra_v2.1_r210.zip

    Engine improvments

    • Isolated pawns eval implementation
    • Reverse futility pruning implementation
    • Razoring implementation
    • Improved promotion moves (extensions and ordering)
    • Improved fp-margin weights
    • minor changes in LMR

    Bug fixes

    • Fixed a bug that occurred during the analysis: sometimes the eval could not coincide with the actual

    Build changes

    • Now the POPCNT build works on SSE3
    • Build doesn't require additional libraries
    • Smaller size (for Windows)

    Test results

    tc: 10s+0.1s
    Hash: 16mb
    
    Score of Zevra v2.1 r210 vs Zevra v2.0 r172: 749 - 466 - 785  [0.571] 2000
    Elo difference: 49.49 +/- 11.90
    

    Code length: 3047 lines

  • v2.0_r172   Zevra v2.0 r172
    eedd768b · v2.0 release ·

    Zevra v2.0 release!

    First release. +100-150 elo above Zevra v1.8.6!

    Zevra Gauntlet 60s+0.6s 64mb (link):

     # PLAYER                      :  RATING  ERROR  POINTS  PLAYED   (%)  CFS(%)     W    D     L  D(%)  OppAvg
     1 GreKo 2018.08               :  2814.9   32.5  1606.0    1700    94     100  1552  108    40     6  2304.1
     2 Asymptote v0.3              :  2542.1   43.6   195.5     300    65     100   166   59    75    20  2431.6
     3 Zevra v2.0 r172             :  2431.6   24.0   929.5    1800    52      90   799  261   740    15  2430.8
     4 Galjoen 0.39.2              :  2415.6   17.9  1104.0    1700    65     100   938  332   430    20  2304.1
     5 Isa 2.0.64                  :  2346.5   43.5   114.5     300    38      97    86   57   157    19  2431.6
     6 Zevra v1.8.6 r672 popcnt    :  2303.5   16.5  1715.0    3700    46     100  1174  682  1644    19  2390.0
     7 CT800 V1.31 64 bit          :  2266.2   17.6   763.5    1700    45      86   595  337   768    20  2304.1
     8 Baislicka                   :  2253.4   18.3   654.0    1400    47      64   501  306   593    22  2276.8
     9 Zevra v1.8.5 r664           :  2250.0   ----  1304.0    3500    37     100   981  646  1873    18  2390.0
    10 Hedgehog 1.9 64-bit         :  2199.8   18.2   614.0    1700    36     ---   419  390   891    23  2304.1
    
    White advantage = 28.96 +/- 3.64
    Draw rate (equal opponents) = 21.79 % +/- 0.50

    Download: Zevra_v2.0_r172.zip

    Other builds (for Linux and macOS) you can download here: sdchess.ru