Introduction

Octochess is a free open source chess engine distributed under the terms and conditions of the GNU General Public License (GPL). Octochess has been created by Tim Kosse.

Features

Cross-platform
Both CECP and UCI protocol
Up to 64 CPU cores
Multi-PV analysis mode
Include/Exclude moves from analysis
Self-generated opening book

Internals

Tweakable evaluation
Special evaluation for known endgames
Bitboard representation with magic multiplication
Principal Variation Search
Aspiration Windows
Lockless transposition hash table
Null-move pruning
Killer move heuristic
Internal iterative deepening
Static Exchange Evaluation
Mate-Distance pruning
Late Move Reductions
Futility pruning
Razoring

Getting Octochess

Binaries

The Windows and Linux binaries provided here require a 64bit x86 CPU, ideally with POPCNT instruction set. The Windows binaries require at least Windows Vista.

Octochess Revision r5190 (Windows, Linux, Kindle (Touch, Paperwhite))

Previous versions

Source code

You can check out the source of Octochess from this subversion repository:

https://svn.filezilla-project.org/svn/chess/

Requirements:

GCC 4.7 or higher to compile under Linux
Visual Studio 2012 or higher to compile under Windows
Unless governed by your GUI, a third of your physical RAM

Thanks

I've read countless articles, papers, websites and forum posts and would like to thank everyone for sharing their knowledge about chess engine programming. In particular however I would like to thank the following people:

Colin Frayn for his website on Computer Chess Programming Theory as starting point for my research and implementation.
Robert Hyatt for his paper on lockless transposition tables and his insight posted on the TalkChess.com forums.
The contributers to the Chess Programming Wiki.
Fritz Reul for his New Architectures in Computer Chess thesis.
Mikael Kilpeläinen for playing many man vs. machine matches against "The Monster".

Contact

Please send an email to tim.kosse@filezilla-project.org

Links

FileZilla Project Another open source project lead by Tim Kosse.

XBoard and WinBoard homepage A free and open source user interface for chess engines.

Chess Programming WIKI Invaluable resource for all wanting to create a chess engine.

TalkChess.com Computer Chess Discussion Forum.

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This policy has been last updated on 2018-05-23.