Beowulf

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[ Beowulf fighting the dragon [1] Beowulf,

a Chess Engine Communication Protocol compatible open source engine, the game-playing brains behind the ChessBrain project, a distributed computing project similar to SETI@home, that aims to harness the collective calculating power of individual computers over the internet to play a game of chess [2] . Colin Frayn is head of the project and primary Beowulf author, supported by Dann Corbit, Ron Murawski, Carlos Justiniano et al.. The version history ends with version 2.3, February 13, 2004, version 2.4 from August 21, 2010 is the latest released version with several bug fixes [3] . Beowulf is published under GNU General Public Licence V2.

Features#

[4]

• Rotated Bitboard Move Generator
• Advanced Static Analysis Function
• Static Exchange Evaluator for Quiescence Pruning
• Quiescence Search Delta Cuts
• Adaptive Depth Null move with Verification Search
• Adaptive Razoring [5]
• Innovative Design of Hashtables
• Internal Iterative Deepening
• Aspiration Window Search
• History and Killer Move Heuristics
• Numerous Search Extensions
• XBoard/ WinBoard Support
• Opening Book Support
• Endgame Tablebase Support ( Nalimov)
• Matt Taylor’s Folded BitScan (board.c)
• Variable Skill Levels
• Test Suite Support
• ISAAC64 Pseudorandom Number Generator by Bob Jenkins, 1996, [6] modifications by Ron Murawski, 2001

Forum Posts#

2000 …#

• On Beowulf - long post by Vincent Diepeveen, CCC, April 04, 2001
• Beowulf v1.5 Has Been Released by Colin Frayn, CCC, June 21, 2001
• Beowulf 1.6d by Dann Corbit, CCC, August 30, 2001
• Beowulf v1.7 Released by Colin Frayn, CCC, October 11, 2001
• Beowulf v1.8 Released by Colin Frayn, CCC, December 08, 2001
• Beowulf v1.9 Released by Colin Frayn, CCC, February 06, 2002
• Beowulf v2.0 Release! by Colin Frayn, CCC, October 06, 2002
• Beowulf hot spots shown pictorially by Dann Corbit, CCC, June 20, 2002
• Beowulf v2.1 by Colin Frayn, CCC, October 06, 2002
• New Beowulf Finally *officially) Released by Colin Frayn, CCC, December 16, 2002
• Beowulf curve calibration results for depth = 5 plies by Dann Corbit, Winboard Forum, June 07, 2004

2005 …#

• Beowulf has Moved! by Colin Frayn, CCC, June 30, 2005
• Beowulf Fixed (I hope) by Colin Frayn, CCC, September 07, 2005
• Beowulf 2.4 Windows 64-bit build available by Jim Ablett, CCC, December 15, 2007
• Beowulf 2.4 Windows-executable version by Norbert Raimund Leisner, CCC, August 23, 2008

2010 …#

• Beowulf v2.4a chess engine by Norbert Raimund Leisner, CCC, August 22, 2010
• [TrappyBeowulf - A Beowulf mod to use Trappy Minimax] by Jim Ablett, CCC, January 30, 2013 [7]

External Links#

Chess Engine#

• Beowulf Computer Chess Engine
• Beowulf version history
• Computer Chess Programming Theory
• Beowulf 2.4a 64-bit in CCRL 40/40
• probabilityZero/TrappyBeowulf · GitHub by Mike Vollmer

Misc#

• Beowulf (disambiguation) from Wikipedia
• Beowulf from Wikipedia
• Beowulf (hero) from Wikipedia
• Beowulf cluster from Wikipedia
• List of Beowulf characters from Wikipedia
• The Dragon (Beowulf) from Wikipedia
• Beowulf: The Legend from Wikipedia

References#

1. ↑ A 1908 depiction of Beowulf fighting the dragon by J. R. Skelton, Illustration in the children’s book Stories of Beowulf ( H. E. Marshall), published in New York in 1908 by E. P. Dutton & Company, Beowulf from Wikipedia, The Dragon (Beowulf) from Wikipedia
2. ↑ ChessBrain
3. ↑ Re: Beowulf v2.4a chess engine by Tony Mokonen, CCC, August 25, 2010
4. ↑ Beowulf version history
5. ↑ Beowulf 2.4 Windows 64-bit build available by Jim Ablett, CCC, December 15, 2007
6. ↑ ISAAC, a fast cryptographic random number generator
7. ↑ probabilityZero/TrappyBeowulf · GitHub by Mike Vollmer

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