Mediocre Chess: [New Version] v0.4 - Ponder, revamped search, UCI only

Nov 27, 2011

[New Version] v0.4 - Ponder, revamped search, UCI only

Changes:

Any hash move used is now verified, this fixes a very rare occurrence of Mediocre crashing
The transposition table is now using the full 64 bit zobrist keys
The search was completely rewritten, possibly catching some bugs. Should show help quite a bit in playing strength
Ponder implemented
Removed the dependency of a settings file, things like hash sizes are now done through the UCI protocol
Removed the semi-working xboard protocol entirely. Sorry.

Note: This version is notably stronger than version 0.34, mainly due to bugfixes in the search.

Mediocre is as mentioned an UCI only engine from here on. This also means I've removed old settings file, use the UCI settings commands mentioned in the readme file.

Download here

5 comments:

Anonymous said...: How to implement in Arena? I can only get the old version to work..; November 28, 2011 at 9:17 AM
Jonatan Pettersson said...: Simply use the Mediocre.bat as install file.

When you choose "Install new engine" you can change the "Files of type:" to *.bat, and then just pick Mediocre.bat.; November 28, 2011 at 12:43 PM
Anonymous said...: Thanks! It failed when I tried to use the installation wizard, but it works now when I add it manually.
Good work!; November 28, 2011 at 9:02 PM
ZirconiumX said...: Bugsie alert!

Exception in thread "main" java.lang.UnsupportedClassVersionError: Bad version number in .class file
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:620)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
at java.net.URLClassLoader.access$100(URLClassLoader.java:56)
at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:242)
at org.eclipse.jdt.internal.jarinjarloader.JarRsrcLoader.main(JarRsrcLoader.java:56); December 3, 2011 at 5:58 PM
Jonatan Pettersson said...: Sounds like you're using an older version of Java.

Usually that exception comes with version information but can see it in your stack trace.

Try updating your Java.; December 5, 2011 at 1:52 PM