Hagrid

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Hagrid,

a WinBoard and UCI compliant chess engine by Klaus Friedel, written in C++, first released in March 2002, while the development started as recently as September 2001 [1]. Hagrid is a bitboard engine and performs Rotated Bitboards to determine sliding piece attacks, while its successor Snitch keeps the plain 8x8 board and piece-lists, using attack tables [2].

Features#

[3]

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• Iterative Deepening
• Aspiration Windows
• Alpha-Beta PVS
• Transposition Table
• Selectivity
  • Fail-High Reductions
  • Null Move Pruning (R=2)
  • Quiescence Search
  • Futility Pruning
  • Delta Pruning
  • Static Exchange Evaluation
• Move Ordering
  • Killer Heuristic
  • History Heuristic
  • MVV/LVA

Evaluation

• Material
• Piece-Square Tables
• Lazy Evaluation
• Pawn Structure
• Pawn Hash Table
• King Safety
• Tuning

Misc#

• Nalimov Tablebases

See also#

• Snitch

Forum Posts#

• New engine “Hagrid” by Klaus Friedel, CCC, March 30, 2002
• New Chess Engine “Hagrid” by Tony Worsman, Winboard Forum, March 30, 2002
• Hagrid new version by Klaus Friedel, Winboard Forum, April 01, 2002
• Hagrid and Chessbase (Fritz 6) GUI by Roger Brown, Winboard Forum, April 03, 2002 » Fritz GUI
• Hagrid 0.7.2 available by Klaus Friedel, Winboard Forum, April 13, 2002
• Hagrid 0.7.45 released ! by Klaus Friedel, CCC, June 16, 2002
• Re: …a new Hagrid-version? by Klaus Friedel, CCC, October 08, 2003
• New engine by Klaus Friedel, Winboard Forum, January 03, 2004
• New engine Snitch 1.0.0 by Klaus Friedel, Winboard Forum, September 28, 2004

External Links#

Chess Engine#

• Snitch and Hagrid two free UCI / Winboard chess engines
• Index of /chess/engines/Norbert’s collection/Hagrid (Compilation)/v0.6.32/hagrid by Norbert Raimund Leisner hosted by Kirill Kryukov
• Index of /chess/engines/Norbert’s collection/Hagrid (Compilation)/v0.7.47/hagrid by Norbert Raimund Leisner hosted by Kirill Kryukov

Misc#

• Rubeus Hagrid from Wikipedia
• Magical creatures in Harry Potter from Wikipedia

References#

1. ↑ Snitch and Hagrid two free UCI / Winboard chess engines - News & History
2. ↑ Re: Attack table by Klaus Friedel, Winboard Forum, October 07, 2004
3. ↑ Snitch and Hagrid two free UCI / Winboard chess engines - Developer

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