Chess engine: Eubos 3.1 (java engine)

Eubos - a basic Java chess engine, written for kicks. Uses jcpi for the UCI protocol parts. Kind of weak, doesn't evaluate for king safety, for example. Now uses transpostion hashing, but because it runs in the Java VM on a bog standard PC, doesn't search very deeply (around 100K Nodes/s, though this is actually quite hard to evaluate due to the hashing). 

Author: Chris Bolt Rating CEDR=2516

v.3.1:

Adds history heuristic to move ordering

Enable knight check threat to evaluation

Tune LMR move and futility thresholds

Disable passed pawn imbalance factor in evaluation

Package required JARs rather than extracting them into the Eubos.jar file

To install Eubos as an engine in Arena:
1. Select Engines > Install New Engine
2. In the file browser dialog that appears, change the drop down to *.bat
3. Navigate to the Eubos binary location, select the Eubos.bat
4. Select UCI protocol to communicate with Eubos
5. That's it! 

Eubos 3.0 - results:

Shuffle 4.4.0	5.5/6	+5	6 Games
Maxwell 3.0.7	5/6	+4	6 Games
Clarity 4.0.0	0/6	-6	6 Games
Akimbo 0.8.0	0/6	-6	6 Games
ChessBrainVB 4.02	0/6	-6	6 Games
Seer 2.8.0	0/6	-6	6 Games
Ceibo 1.0	0.5/4	-3	4 Games
Thrawn 2.0	0.5/4	-3	4 Games
Zangdar 2.24	0/4	-4	4 Games
Cheng 4.42	0/4	-4	4 Games
Critter 1.6a	0/4	-4	4 Games
Zagreus 4.1	1/2	+0	2 Games
Dumb 2.0	0/2	-2	2 Games
4ku 4.0	0/2	-2	2 Games
SF CorChess 010124	0/2	-2	2 Games
SF-PB 010124	0/2	-2	2 Games
Dark 1.0	0/2	-2	2 Games
Dragon free	0/2	-2	2 Games
Protej 20231226b	0/2	-2	2 Games
Killfish 071223	0/2	-2	2 Games
Peacekeeper 2.20	0/2	-2	2 Games

Eubos 3.1 download