Simplex, an UCI compliant open source chess engine by Antonio Torrecillas, written in C++ and licensed under the GNU General Public License. Simplex was first published with sources in 2010, while its development already started at least in 2007 with the intermediate name DarkSimplex due to experiments with the published description of DarkThought [1] [2].
Simplex Servi-Cycle [3]

Features

Board Representation

• Bitboards
• Kindergarten Bitboards

Search

• Iterative Deepening with Aspiration Windows
• Alpha-Beta Principal Variation Search
• Transposition Table
• Quiescence Search
• Null Move Pruning
• Late Move Reductions
• Mate Distance Pruning
• Futility Pruning
• Internal Iterative Deepening
• Killer Heuristic
• History Heuristic

Evaluation

• Material
• Piece-Square Tables
• Tapered Eval
• Lazy Evaluation
• Center Control
• Mobility
• Pawn Structure
  Backward Pawn
  Passed Pawn
  Candidate Passed Pawn
• Evaluation of Pieces
• King Safety

See also

• Rocinante
• Simplex and Complex in Connectivity

Forum Posts

• Simplex chess engine by Olivier Deville, Winboard Forum, November 18, 2009
• Simplex Updated by Antonio Torrecillas, CCC, April 05, 2010
• Simplex 0.9.6 released by Antonio Torrecillas, CCC, September 26, 2010
• Simplex 0.9.7 release by Antonio Torrecillas, CCC, January 10, 2011
• Simplex 0.9.8 by Antonio Torrecillas, CCC, November 20, 2011

External Links

Chess Engine

• Barajando Trebejos (Download Rocinante and Simplex)
• Index of /chess/engines/Jim Ablett/SIMPLEX by Jim Ablett, hosted by Kirill Kryukov
• Simplex ín CCRL 40/4

Misc

• Simplex from Wikipedia
• Pascal's simplex from Wikipedia
• Simplex algorithm from Wikipedia
• Simplex V 1.05 by Peter Österlund
• Simplex graph from Wikipedia
• Simplex (disambiguation) from Wikipedia
• Gaetano Valli - Simplex, Jazz Club Gaio, Ljubljana 2009, YouTube Video
  

References

1. ^ Simplex Updated by Antonio Torrecillas, CCC, April 05, 2010
2. ^ Ernst A. Heinz (1997). How DarkThought Plays Chess. ICCA Journal, Vol. 20, No. 3
3. ^ A Simplex Servi-Cycle at Barber Vintage Motorsports Museum by ChuckSchultz, January 06, 2007, cc-by-sa-2.0, Wikimedia Commons, Simplex Manufacturing Corporation from Wikipedia

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