BigLion, a Chess Engine Communication Protocol aka WinBoard and UCI compliant chess engine by Matthias Gemuh, written in C++ using Borland C++Builder 5.0, first released in April 2002 as announced by Frank Quisinsky [1]. Since 2.23w in fall 2005, BigLion is able to play Chess960 [2].
Sultan the Barbary Lion [3] [4]

Features

Board Representation

• Bitboards
• Rotated Bitboards

Search

• Iterative Deepening
• Aspiration Windows
• PVS
• Selectivity
  • Null Move Pruning
  • Fractional Extensions
  • Razoring
• Move Ordering
  • Hash Move
  • Internal Iterative Deepening
  • Killer Heuristic
  • History Heuristic
  • Static Exchange Evaluation

Evaluation

• Material
• Pawn Structure
• Bishop Pair
• Rook on Open File
• Rook (Queen) on 7th
• Center Control
• Mobility
• Trapped Bishop
• Connectivity
• Early Queen
• King Safety
  • Pawn Shield
  • King Tropism
  • Attacking King Zone
  • Castling rights
• Forks
• Pins

Hash Tables

• Two-tier Transposition Table in Main Search
• Always Replace Transposition Table in Quiescence Search
• Evaluation Hash Table
• Pawn Hash Table
• Move Lists ^[6]

See also

• ChessGUI
• Lion
• Mammal
• Taktix

Forum Posts

2002 ...

• WB/UCI BigLion by Matthias Gemuh is available! by Frank Quisinsky, Winboard Forum, April 23, 2002
• BigLion 0.3 by Matthias Gemuh, Winboard Forum, April 27, 2002
• BigLion now has Homepage by Matthias Gemuh, Winboard Forum, April 30, 2002
• BigLion 0.5 by Matthias Gemuh, Winboard Forum, May 02, 2002
• BigLion 1.0 by Matthias Gemuh, Winboard Forum, July 13, 2002
• BigLion against world elite by Matthias Gemuh, Winboard Forum, August 04, 2002
• BigLion 1.3 by Matthias Gemuh, Winboard Forum, October 11, 2002
• BigLion and Tournaments by Matthias Gemuh, CCC, October 31, 2002
• BigLion and fine 70 by Sune Fischer, Winboard Forum, December 09, 2002 » Lasker-Reichhelm Position

• BigLion says Good Bye by Matthias Gemuh, Winboard Forum, March 01, 2003
• BigLion: Now he too can cheat ! by Matthias Gemuh, Winboard Forum, May 07, 2003
• BigLion+Taktix : no more updates by Matthias Gemuh, Winboard Forum, June 09, 2003
• For Matthias: a question about Big Lion/Taktix by Telmo Escobar, Winboard Forum, June 21, 2003
• BigLion loses 100 Elo points and also 50% speed by Matthias Gemuh, Winboard Forum, August 01, 2003

• About BigLion 2.23n (and AEGT) by Matthias Gemuh, Winboard Forum, July 28, 2004

2005 ...

• Chess960 in Fritz9GUI and Winboard_frc by Matthias Gemuh, CCC, November 24, 2005
  BigLion 2.23w and Taktix 2.23w by Matthias Gemuh, CCC, November 24, 2005
• BigLion 2.23x : 2017 by Patrick Buchmann, CCC, October 06, 2007
• BigLion80 by Matthias Gemuh, CCC, January 16, 2008
• BigLion and burn out by Matthias Gemuh, CCC, July 17, 2009
• CCC Forum vs BigLion chess960 by Spock, CCC, September 14, 2009

2010 ...

• BigLion and his clan have moved by Matthias Gemuh, CCC, July 14, 2014

External Links

Chess Engine

• BigLion Homepage
• BigLion in CCRL 40/40

Misc

• Lion from Wikipedia
• Barbary lion from Wikipedia
• Lion (disambiguation) from Wikipedia
• Manu Dibango - Lion of Africa, at the Barbican Centre, London, March 2007, YouTube Video
  

References

1. ^ WB/UCI BigLion by Matthias Gemuh is available! by Frank Quisinsky, Winboard Forum, April 23, 2002
2. ^ BigLion 2.23w and Taktix 2.23w by Matthias Gemuh, CCC, November 24, 2005
3. ^ Sultan the Barbary Lion, Bronx Zoo , 1899, Wikimedia Commons
4. ^ According to an article from the February 01, 1903 issue of the New York Times, Sultan and a female named Bedouin Maid were gifts to the zoo from Nelson Robinson. “Sultan,” the article states, “is four years old and is considered to be as handsome and perfect a specimen as ever trod a cage floor. He is also unusually good tempered.” from Sultan: A King Among Lions by Vicki Croke, WBUR's The Wild Life, February 17, 2016
5. ^ ChessGUI4Stick.zip\ChessGUI4Stick\Portable_Engines\UCI\BigLion_223\readme.txt
6. ^ BigLion and Tournaments by Matthias Gemuh, CCC, October 31, 2002

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