Calvin 5.1.0

Author(s): Dan Kelsey (NLD)
Release Date: 2025-01-16
Language(s): Java
Repo Owner: kelseyde
Repo URL: https://github.com/kelseyde/calvin-chess-engine

Calvin 5.1.0 brings significant improvements in both search and evaluation. Calvin has a bigger and better neural network, with a hidden layer size of 1024 and 4 king buckets, horizontally mirrored. In search, the biggest improvement was fixing Calvin’s bugged SEE algorithm, which enabled many search and move ordering techniques. Tests against the previous release suggest a strength increase of 124 elo LTC / 106 elo STC.

To run the jar file, you will need to enable the Vector API package which Calvin uses for SIMD, via this command:

java --add-modules jdk.incubator.vector -jar path/to/calvin-chess-engine-5.1.0.jar

https://github.com/kelseyde/calvin-chess-engine/releases/download/5.1.0/calvin-chess-engine-5.1.0.jar
https://github.com/kelseyde/calvin-chess-engine/releases/download/5.1.0/calvin-wrapper-5.1.0.jar
https://github.com/kelseyde/calvin-chess-engine/archive/refs/tags/5.1.0.zip