Chess engine: Eubos 2.9

Since you’re here...

... we have a small favour to ask. More people, like you, are reading and supporting our blog: "Chess Engines Diary". And unlike many other sites and blogs, we made the choice to keep our articles open for all, regardless of where they live or what they can afford to pay.

We hope you will consider supporting us today. We need your support to continue to exist, because good entries are more and more work time. Every reader contribution, however big or small, is so valuable. Support "Chess Engines Diary" even a small amount– and it only takes a minute. Thank you.
============================== My email: jotes@go2.pl

February 28, 2022

Chess engine: Eubos 2.9

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=2072

v.2.9

Features

This is the first Eubos release which incorporates a selective search. All previous releases have been Shannon type-A searches, only utilising Beta pruning

Added Late Move Reductions to the PlySearcher

After the first 6 moves at any ply deeper than 3, the search depth can be reduced by depth/4

There are the usual exemptions

Tuning / Optimisation / Tweaks

DrawChecker is now expanded as the game progresses

Fixes

Bug fixed where, if the game length exceeded 150 moves, the DrawChecker would cause a crash

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 2.9 download