Zevra 2 is free and open-source UCI chess engine.

Compilation commands

• make all - creating a build optimized for your CPU (will not work on other PCs)
• make popcnt - creating a universal build with support for POPCNT instructions
• make nonpopcnt - creating a universal build without the support of the POPCNT instruction
• make release - creating a universal builds with POPCNT and without POPCNT instruction

Game level

Last versions of Zevra

# PLAYER                      :  RATING  ERROR  POINTS  PLAYED   (%)
1 WyldChess                   :  2678.1   22.4   813.0    1072    76
2 Zevra v2.4 r380             :  2589.6   21.1   697.0    1083    64
3 Zevra v2.3 r348 popcnt      :  2543.0   20.8   617.5    1073    58
4 Galjoen 0.41.2              :  2503.7   20.7   553.5    1071    52
5 CT800 V1.43 64 bit          :  2493.8   20.7   540.0    1074    50
6 Zevra v2.2.1 r328 popcnt    :  2433.7   20.6   441.5    1070    41
7 Loki 3.5.0                  :  2421.5   20.9   424.5    1074    40
8 Zevra v2.1.2 r248           :  2419.0   ----   419.0    1071    39
9 Teki 2                      :  2355.1   21.3   324.0    1072    30

Project inspired

• Chess programming wiki: https://www.chessprogramming.org/Main_Page
• Stockfish: https://github.com/official-stockfish/Stockfish
• Ethereal: https://github.com/AndyGrant/Ethereal

Thanks

Guardian, Graham Banks (the creator of many tournaments with different engines), Ratosh (Pirarucu dev.), Daniel Anulliero(Isa dev.), Evgeny Kotlov (Hedhehog dev.), Sergey Kudryavtsev (sdchess.ru creator), Rasmus Althoff (CT800 author).