Zevra 1.6.2 r536

[Graham Banks]

New release of Zevra: Zevra v1.8.5. Improved recognition of three-fold repetition of the position, added estimates of mg-eg for pawns, minor changes in the search.
The gain is approximately 20-30 points in 60+0.6.

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tc=60m+0.6s
hash=64mb

Score of Zevra v1.8.5 r664 vs Zevra v1.8.4 r650: 638 - 521 - 459  [0.536] 1618
Elo difference: 25.17 +/- 14.34

Thanks.

[sovaz1997]

New version of Zevra v1.8.6!

https://github.com/sovaz1997/Zevra/rele ... 1.8.6_r672

tc=5s+0.05s, Hash=64mb, book=8moves_GM.pgn

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Score of Zevra v1.8.6 r672 vs Zevra v1.8.5 r664: 457 - 244 - 299  [0.607] 1000
Elo difference: 75.15 +/- 18.26

tc=20s+0.2s, Hash=64mb, book=8moves_GM.pgn

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Score of Zevra v1.8.6 r672 vs Zevra v1.8.5 r664: 423 - 192 - 385  [0.616] 1000
Elo difference: 81.73 +/- 17.04

Zevra and Ethereal testing: https://sites.google.com/view/scet-testing/zevra

[CMCanavessi]

Nice improvement !!!

[Graham Banks]

Thanks for the new version and congratulations on a nice improvement.

[sovaz1997]

I hope there will be a good improvement in long time control too. Now I do additional testing against other engines
Thank you for your tournaments!

[Dariusz]

Hi

This is very interesting engine.
Below link to Mac executable

Zevra-1.8.6_r672_Mac_Compilation.zip

[sovaz1997]

Thanks for compiling for macOS!

Now I have tests against other engines with a tc of 60s+0.6s:

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# PLAYER                      :  RATING  ERROR  POINTS  PLAYED   (%)
1 GreKo 2018.08               :  2807.4   69.2   381.5     400    95
2 Galjoen 0.39.2              :  2431.7   37.1   283.5     400    71
3 Zevra v1.8.6 r672 popcnt    :  2299.8   30.5   423.5    1000    42
4 Baislicka                   :  2272.2   34.6   198.5     400    50
5 Zevra v1.8.5 r664           :  2250.0   ----   367.5    1000    37
6 CT800 V1.31 64 bit          :  2246.6   34.3   184.0     400    46
7 Hedgehog 1.9 64-bit         :  2206.1   34.0   161.5     400    40

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1) Zevra v1.8.6 r672 popcnt 2299.8 :   1000 (+330,=187,-483),  42.4 %
   vs.                             :  games (   +,   =,   -),   (%) :    Diff,    SD, CFS (%)
   GreKo 2018.08                   :    200 (   5,  15, 180),   6.3 :  -507.6,  35.0,    0.0
   Galjoen 0.39.2                  :    200 (  43,  42, 115),  32.0 :  -132.0,  18.5,    0.0
   Baislicka                       :    200 (  84,  39,  77),  51.8 :   +27.5,  17.3,   94.4
   CT800 V1.31 64 bit              :    200 (  96,  38,  66),  57.5 :   +53.2,  17.6,   99.9
   Hedgehog 1.9 64-bit             :    200 ( 102,  53,  45),  64.3 :   +93.7,  17.6,  100.0

2) Zevra v1.8.5 r664        2250.0 :   1000 (+280,=175,-545),  36.8 %
   vs.                             :  games (   +,   =,   -),   (%) :    Diff,    SD, CFS (%)
   GreKo 2018.08                   :    200 (   1,  10, 189),   3.0 :  -557.4,  35.3,    0.0
   Galjoen 0.39.2                  :    200 (  33,  39, 128),  26.3 :  -181.7,  18.9,    0.0
   Baislicka                       :    200 (  79,  38,  83),  49.0 :   -22.2,  17.6,   10.4
   CT800 V1.31 64 bit              :    200 (  78,  46,  76),  50.5 :    +3.4,  17.5,   57.7
   Hedgehog 1.9 64-bit             :    200 (  89,  42,  69),  55.0 :   +43.9,  17.3,   99.4

All tests here: https://sites.google.com/view/scet-testing/zevra

[Dariusz]

Below link to popcnt version for macOS executable.
According to information from sovaz1997, it can work on any other Mac.

Zevra-1.8.6_r672_Mac_Compilation_popcnt.zip