Jackychess 25.12 JA - new version chess engine

Jacky Chess - a simple UCI chess engine written in Java.

Author: Matthias Lang  Rating CEDR=2779

The engine is written from scratch as an educational project to learn chess programming.

It started as a simple proof of concept experiment on a weekend, but is now derived to a stable playing UCI engine.

This project is mainly a self educational project to learn the various algorithms around chess computers. Inspiration was mainly given by the great chess programming wiki

https://www.chessprogramming.org/ where you can get a good overview about all used

algorithms.

v.25.12:

Official release since 25.04.

Estimated Elo strength: ~2940, ~80 Elo stronger

add singular extensions

lmr: more criterias like history heuristic in reduction calculation

support for UCI pondering

code refactoring

Jackychess 25.09 JA - results:

Kreveta 1.2.4	4/4	+4	4 games
Wilted 1.0.0.0	4/4	+4	4 games
CeeChess 2.2	2.5/4	+1	4 games
Critter 1.6a	0.5/4	-3	4 games
Prune 2.2.0	0.5/4	-3	4 games
PlentyChess 7.0.22	0.5/4	-3	4 games
Halogen 15.21.0	0/4	-4	4 games
Ynode 0219	0/4	-4	4 games
Halogen 15.23.0	0/4	-4	4 games
Chess-rs 0.6.0	2/2	+2	2 games
Iteration1Moodle 0.10	2/2	+2	2 games
Echekinator 1.0	2/2	+2	2 games
Chess-rs 0.6.0 JA	2/2	+2	2 games
Algae 1.0 JA	2/2	+2	2 games
Moodle 0.10	2/2	+2	2 games
Shark 2025-10-13	2/2	+2	2 games
Tarnished 4.0 dev.1137 JA	1.5/2	+1	2 games
Chessnix 1.0	1/2	+0	2 games
Isa 4.5	0.5/2	-1	2 games
Tcheran 8.0	0.5/2	-1	2 games
Vajolet2 Perspective v1 JA	0/2	-2	2 games

Jim Ablett compiles:

Jackychess 25.09 JA download