Dirty, EveAnn and Caligula are Windows Winboard compatible chess engines. They are console programs, to use them you need a graphical interface (GUI). The most popular are Winboard, Scid, Arena, Cutechess . . . you can find them easily. Also there are lot of tutorials to install the apps and the engines.
Dirty is a Winboard compatible Chess Engine written by Pradu Kannan (Buzz), Fonzy Bluemers and Andrés Valverde (earlier versions) . Later versions are maintained by Fonzy. It is quite strong. Latest version freely downloadable is :
( 3.023 CCRL . April 27, 2025 )
Read the zipped README file for more info.
Older versions:
Dirty Duna ( 3.012 ELO CCRL )
Dirty Cucumber (2.941 ELO CCRL)
EveAnn is a small Winboard chess engine written by Andrés Valverde. From version 2.0 it uses NNUE based on Danasah 9.1 dananet3.nnue, reinforced with games from CCRL+CEGT played at very long time control (more than 300 million positions. You can download and use it completely for free :
( Some bugs fixed. futility on. Maybe +10 ELO October 16, 2025 )
Read the zipped README file for more info.
Older versions:
EveAnn 3.5 ( Some bugs fixed. ~3.220 ELO CCRL October 9, 2025 )
EveAnn 3.4 (Some bugs fixed. Some search tweaks, ~3.200 ELO CCRL aprox. June 13, 2025 )
EveAnn 3.2 (Some bugs fixed. around 3.150 ELO CCRL . 01/05/2025 changes in readme.txt inside the package. Only Windows 64-bit available)
EveAnn 3.1 (around 3.140 ELO CCRL . 26/04/2025 changes in readme.txt inside the package. Only Windows 64-bit available)
EveAnn 3.0 x64 (3.107 ELO CCRL . 11/01/2025 changes in readme.txt inside the package)
EveAnn 3.0 x32 (In case the 64-bit version is not running in your PC.)
EveAnn 2.2 (bug-fix 3.037 ELO CCRL)
EveAnn 2.1 (3.035 ELO CCRL)
EveAnn 2.0 (2.850 ELO CCRL aprox)
EveAnn 1.73 (HCE 2.345 ELO CCRL)
EveAnn 1.71 (2.300 ELO CCRL)
Caligula is a Winboard chess engine written by Pedro Castro taken TSCP ( (c) Tom Kerrigan) as a base, but adding lot of features and making it a 2.700 ELO CCRL engine.
From version 2.0 I have implemented David Carteau's Cerebrum library , as well as other minor changes. The plan is to train bigger and better networks as the library is improved. Current network is trained with Cerebrum 1.0, and soon I''ll train a new one with Cerebrum 1.1 and newers.
You can download and use it completely for free :
( 2985 ELO CCRL November 27, 2025 )
Read the zipped README file for more info.
Older versions and history about the engine can be found at Pedro's home site
Feel free to contact me at andres(dot)valverde(dot)toresano@gmail(dot)com