Welcome to the Crafty Chess page     

Crafty 23.4 is the current stable release.

Crafty is a free, open-source computer chess program developed by Dr. Robert M. Hyatt.  Crafty is constantly being improved by a small team of contributors, including Dr. Hyatt.  To learn more about Crafty, visit Dr. Hyatt's home page.

A freeware Graphical User Interface for Crafty has been written by Valters Baumanis, using his on-line chess client “Nightmare Online”.  This thing is pretty cool.  It even uses the new SKILL option to adjust Crafty's strength.  Just download and play.  Visit Valters Baumanis's web site for details.

Crafty 23.4 source files can be downloaded here or on Dr. Hyatt's ftp site.
Windows executables are available on Peter Skinner's web site.

A book.bin file compatible with Crafty 23.4 is available here.

Crafty can be compiled and executed from a terminal window on a Macintosh, Windows or Linux computer.  Crafty can also be run with a GUI interface such as Winboard (Windows) or Xboard (Linux).

Crafty can be configured for a stronger game by setting some optional parameters (examples below).  These parameters can be put into the crafty.rc file, or used as start-up parameters from the terminal.  A more thorough explanations of Crafty's parameters can be found here.

ponder on (Allows Crafty to think on your time)
hash=256m (Increases Crafty's position hash to 256MB)
hashp=64m (Increases Crafty's pawn hash to 64MB)
egtb (Tells Crafty to use Nalimov Endgame Tables (up to 6-Men))
cache=32m (Increases Crafty's Endgame Table Cache to 32MB)
swindle on (Allows Crafty to try to win drawn games (according to Endgame Tables))
mt=2 (Increases Crafty's MaxThreads to 2 for a dual CPU computer)

This is a personal page managed by Mr. Tracy Riegle, Hershey Pennsylvania, ICC Regal1.

I can be contacted via e-mail at tracy@pacyber.com.  The subject line MUST contain the word 'Crafty' or my spam filter will trash it.  Please allow a day or three for a response.

This page was last updated on July 6th, 2012.

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