Sharper
Card-Sharpers [1]
Sharper,
a Chess Engine Communication Protocol aka WinBoard compliant chess engine by Albert Bertilsson, written in C++. Sharper emerged in 2002 and 2003 from Albert's former engine #Chess, which was written in C# [2]. Released in 2003 [3], Sharper became a reference engine for Perft and Divide results.
Contents
Features
Board Representation
Search
- Iterative Deepening
- Aspiration Windows
- Alpha-Beta
- Transposition Table
- Zobrist Hashing
- Quiescence Search
- Verified Null Move Pruning
- Fractional Extensions
- Move Ordering
Evaluation
Misc
See also
Forum Posts
2003
February ...
- To Uri, about perft speeds by Albert Bertilsson, Winboard Forum, February 14, 2003 » Perft
- Perft 9, confirmed by Sharper too... by Albert Bertilsson, Winboard Forum, February 16, 2003
- Why have a UnMakeMove or UndoMove function (not as stupid as it sounds)? by Albert Bertilsson, CCC, February 24, 2003 » Unmake Move
- New engine, Sharper 0.02! by Albert Bertilsson, Winboard Forum, March 09, 2003
- Sharper version 0.03 released! by Albert Bertilsson, Winboard Forum, March 12, 2003
- Adding knowledge to the evaluation, what am I doing wrong? by Albert Bertilsson, CCC, March 13, 2003
- WACNEW 40% less fails when Sharper get 12x the time by Albert Bertilsson, CCC, March 17, 2003 » Win at Chess
- What's best low BF or good WAC result? by Albert Bertilsson, CCC, March 18, 2003 » Branching Factor
- Buggy check extensions, back to square one =(. by Albert Bertilsson, CCC, March 20, 2003 » Check Extensions
- Sharper 0.04 released by Albert Bertilsson, Winboard Forum, March 22, 2003
- I search for an opening book for my engine... by Albert Bertilsson, CCC, March 26, 2003
April ...
- Sharper 0.06 released! by Albert Bertilsson, Winboard Forum, April 04, 2003
- My engine doesn't understand this position neither do I by Albert Bertilsson, CCC, April 25, 2003
- Sharper 0.07 by Albert Bertilsson, Winboard Forum, April 26, 2003
- Dual processor owners, please help me with 15 min of CPU time by Albert Bertilsson, CCC, May 23, 2003
June ...
- Sharper 0.10 released by Albert Bertilsson, Winboard Forum, June 25, 2003
- Problem with extending to maxdepth by Albert Bertilsson, CCC, June 26, 2003 » Extensions
- Improvements in BF makes my MoveGen suck =( by Albert Bertilsson, CCC, June 26, 2003 » Branching Factor, Move Generation
- Program settings (Re: Programmers Should Take A Cue From Chessmaster) by Albert Bertilsson, CCC, July 04, 2003 » Piece-Square Tables
- How stable is stable enough for you? by Albert Bertilsson, CCC, July 24, 2003
- Sharper 0.11 released by Albert Bertilsson, Winboard Forum, July 27, 2003
- Sharper 0.12 released by Albert Bertilsson, Winboard Forum, July 31, 2003
August ...
- Sharper 0.14 released! by Albert Bertilsson, Winboard Forum, August 03, 2003
- Sharper version 0.16 released by Albert Bertilsson, Winboard Forum, October 22, 2003
- Highest perft for initial position? by Albert Bertilsson, CCC, November 07, 2003 » Perft
- Anybody interested in a new version of Sharper? by Albert Bertilsson, Winboard Forum, November 24, 2003
- Sharper 0.17 released by Albert Bertilsson, Winboard Forum, November 27, 2003
- A few Sharper pertfhash 8 benchmarks by Frederic Louguet, CCC, December 18, 2003
2004
- Newer version of Sharper is available by Albert Bertilsson, Winboard Forum, January 11, 2004
- Improving the endgame of my engine by Albert Bertilsson, CCC, April 08, 2004 » Endgame
2010 ...
- perft/divide bug in roce38 and Sharper? [SOLVED] by thedrunkard, Winboard Forum, October 16, 2013 » Perft, ROCE
External Links
Chess Engine
Misc
References
- ↑ Card-sharpers by candlelight by Feliks Pęczarski, oil on canvas, 1845, Current location: National Museum, Warsaw, Wikimedia Commons, Card sharp from Wikipedia
- ↑ #Chess (Wayback Machine)
- ↑ New engine, Sharper 0.02! by Albert Bertilsson, Winboard Forum, March 09, 2003
- ↑ Features based on History.txt, November 2003
- ↑ Program settings (Re: Programmers Should Take A Cue From Chessmaster) by Albert Bertilsson, CCC, July 04, 2003
