Scorpio Bitbases

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Scorpio Bitbases, are compact endgame bitbases created by Daniel Shawul with WDL information of up to 5-men, well suited to probe inside the search as applied in Daniel's engine Scorpio. The 5-men WDL holds in 200 MB. In order to make progress in won egtb-positions near the root, various evaluation heuristics are necessary to modify winning scores accordantly, considering material, ply-distance to the root, pawn closeness to promotion, distance of pieces to the opponent king, etc..

=Open Source= Scorpio Bitbases are open source, since October 2013 distributed under the BSD license. Under Windows, probing is encapsulated via a Dynamic-link library, which already provides a heuristic score instead of pure WDL information in order to make progress at the root without the need to probe huge DTC/DTM tablebases. As of January 2014, Daniel finished the 6-men Scorpio Bitbases, available from Joshua Shriver's torrent site.

=See also=
 * Bitbases
 * Edwards' Tablebases
 * Gaviota Tablebases
 * Lomonosov Tablebases
 * Nalimov Tablebases
 * Scorpio
 * Syzygy Bases
 * Thompson's Databases

=Forum Posts=

2005 ...

 * Bitbases - yace, scorpio, gambitfruit by Bernhard Bauer, CCC, December 06, 2005
 * Re: Open Source bitbase program by Daniel Shawul, CCC, April 12, 2007
 * Scorpio BBs, licenses by Zach Wegner, CCC, January 28, 2008
 * Scorpio endgame bitbase specs? by Ilari Pihlajisto, CCC, December 02, 2008
 * New Scorpio bitbase files by Dann Corbit, CCC, March 09, 2009
 * Scorpio bitbases by Matthias Gemuh, CCC, April 06, 2009
 * Scorpio bitbases with linux. Any success? by Joona Kiiski, CCC, April 29, 2009
 * EGBB implementation by Michael Hoffmann, CCC, September 24, 2009

2010 ...

 * Some tablebase formats by BB+, OpenChess Forum, November 25, 2010
 * bitbase access by Scorpio versions... Dan Shawul? by Ernest Bonnem, CCC, May 28, 2012
 * pawn enumeration by Daniel Shawul, CCC, July 24, 2012
 * Re: Search with bitbase by Daniel Shawul, CCC, September 05, 2012
 * Houdini 3 with Scorpio Bitbases Question by Milton Zucker, CCC, October 16, 2012

2013

 * Re: syzygy question (for Ronald) by Daniel Shawul, CCC, October 04, 2013
 * Scorpio Egbb Thread by Joshua Shriver, CCC, October 07, 2013
 * What happens using egbb by Kai Laskos, CCC, October 12, 2013
 * Scorpio E.G.T.B. by AxeFever, Rybka Forum, October 22, 2013
 * Syzygy / egbb discussion by Daniel Shawul, CCC, October 23, 2013 » Syzygy Bases
 * Scorpio bitbases question by Harm Geert Muller, CCC, December 25, 2013

2014 ...

 * Scorpio 6men EGBB Now available by Joshua Shriver, CCC, January 14, 2014
 * 50 Gb 6-men scorpio bitbases available by stackOVERFLOW, OpenChess Forum, January 14, 2014
 * Stockfish goes EGBB by Daniel Shawul, CCC, January 29, 2014 » Stockfish
 * Scorpio & egbb issue (OSX) by Max May, CCC, February 01, 2014 » KBNK Endgame
 * Performance of Syzygy and Scorpio by Kai Laskos, CCC, February 04, 2014 » Syzygy Bases
 * Problem position using Scorpio Egbbs by Ross Boyd, CCC, March 11, 2018
 * Egbb dll neural network support by Daniel Shawul, CCC, May 29, 2018 » Neural Networks

2020 ...

 * Re: Hacking around CFish NNUE by Daniel Shawul, CCC, October 15, 2020 » NNUE
 * Re: How to scale stockfish NNUE score? by Daniel Shawul, CCC, October 17, 2020 » Stockfish NNUE
 * EGBB (endgame bitbases) questions ... by Frank Quisinsky, CCC, November 15, 2020

=External Links=
 * Scorpio Chess and Nebiyu Alien
 * dshawul/egbbdll · GitHub
 * dshawul/Scorpio · GitHub includes Six men egbb code
 * OICS Chess and EGTB Tracker Statistics by Joshua Shriver
 * Index of /tablebases/scorpio by kingliveson

=References=

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