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Xpdnt,
an open source chess engine by David B. Weller, written in C and compliant to the Chess Engine Communication Protocol. Already announced in 2005, Xpdnt was first released in April 2006 ^[1], the so far latest update appeared in October 2009 ^[2].

Features

^[3]

Board Representation

• 16x16 Vector Attacks
• Piece-Lists

Search

• Iterative Deepening
• Aspiration Windows
• Principal Variation Search
• Transposition Table
• Selectivity
  • Quiescence Search
  • Delta Pruning
  • Futility Pruning
  • Mate Distance Pruning
  • Null Move Pruning
  • Razoring
  • Check Extensions
  • One Reply Extensions
  • Mate Threat Extensions
  • Pawn to 7th Rank Extensions
• Move Ordering
  • Killer Heuristic
  • History Heuristic
  • Internal Iterative Deepening
  • Static Exchange Evaluation

Evaluation

• Material
• Trapped Pieces
• Outposts
• Mobility
• Piece-Square Tables
• Pawn Structure
  • Passed Pawns
  • Weak Pawns
• King Safety
  • Pawn Shield
  • Pawn Storm
  • Tropism
  • Square Control
  • Rook or Queen on open files near the King
  • Scaling by Material
• King Centralization in the Endgame

See also

• GES

Forum Posts

2005 ...

• NPS by David B. Weller, Winboard Forum, August 27, 2005
• Beta Testers needed by David B. Weller, Winboard Forum, April 16, 2006
• New version of Xpdnt by David B. Weller, Winboard Forum, June 02, 2006
• XPDNT 061120 released by David B. Weller, Winboard Forum, November 20, 2006
• xpdnt_071017 released by David B. Weller, CCC, October 17, 2007
• Xpdnt 071115 win32 Intel compiler 10 p.g.o available by Jim Ablett, CCC, November 15, 2007

2008 ...

• Xpdnt 080209 by David B. Weller, CCC, February 10, 2008
• Xpdnt 080209 by David B. Weller - Win32 JA build by Jim Ablett, Winboard Forum, February 10, 2008
• Xpdnt_080716 by David B. Weller, CCC, July 16, 2008
• Xpdnt 080904 by David B. Weller, CCC, September 10, 2008
• Xpdnt 080927 by David B. Weller, CCC, October 09, 2008
• xpdnt 090704 released by David B. Weller, CCC, July 10, 2009
• Xpdnt_091007 Released by David B. Weller, Winboard Forum, October 14, 2009

2010 ...

• Xpdnt 091007 - CCRL 40/4 Result by Adam Hair, CCC, August 22, 2010

External Links

• Xpdnt: Free chess engine
• Xpdnt 091007 in CCRL 40/4
• Index of /chess/engines/Jim Ablett/XPDNT compiled by Jim Ablett, hosted by Kirill Kryukov
• Index of /chess/JA-Bundle-Final/XPDNT

References

1. ^ Beta Testers needed by David B. Weller, Winboard Forum, April 16, 2006
2. ^ The Gaviota Saga by Graham Banks, CCC, November 09, 2009
3. ^ based on the sources Xpdnt: Free chess engine

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