SOS

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SOS is a chess program developed and written by Rudolf Huber in C. In its early times in the mid 90s, SOS running on various platforms and operating systems had an own futuristic graphical user interface. SOS supported the Chess Engine Communication Protocol [1] , was available as Young Talent by ChessBase running under the Fritz6 GUI [2] , and since Rudolf is co-designer of the protocol, it finally changed to UCI [3] , and is a Partner Chess Engine of Arena [4] [5] . SOS evolved from PVS to MTD(f) and further as ParSOS to parallel MTD(f).
Silicon on Sapphire [6]

Tournaments

SOS has its debut at Don Beal's 1993 QMW Uniform-Platform Computer Chess Championship. It further played various World Microcomputer Chess and World Computer Chess Championships, the WMCCC 1993, WCCC 1995, WMCCC 1997, WCCC 1999, and the WMCCC 2000, where SOS won the title of the Amateur World Microcomputer Chess Champion. ParSOS continued playing the WMCCC 2001, WCCC 2002, WCCC 2003, WCCC 2004 and the WCCC 2006. SOS played most IPCCCs, and also competed at International CSVN Tournaments.

Descriptions

[7]

1995

SOS is a conventional chess program. It uses depth first minimax tree search with quiescence search, alpha-beta enhancement, minimal window search and null-move pruning. To improve the search efficiency, the history heuristic and a transpositional table is used. The search is extended to deeper plies on those move sequences which have a high probability of being part of the principal variation. For SOS, those sequences are recaptures and check evasions. Leaf node evaluation considers only material, piece placement and pawn structure and only about 10% of the CPU time is spent on this (not including the quiescence search which is capture only, but extends on "losing" captures which are checks and on checking sequences). The evaluation parameters are dynamic and continuously updated during tree search. SOS's weakest part is probably endgame knowledge. SOS actively plays a wide range of openings, but most of those lines are not very deep. With autoplay games against itself, the opening book is tuned to favour those lines which harmonize with SOS's style of play.

1999

SOS is an amateur program which was started in 1993 and has since then competed in a number of tournaments. The newest version runs on multiprocessor systems with a parallelized version of mtd(f) as its minimax search algorithm. SOS used to be a relatively fast searcher and relied on outsearching the opponent. This has changed now and more knowledge and special cases have been implemented which slow it down. Little effort is spent on the opening book. It plays a very broad range of openings. However it learns to avoid unsuccessful lines and tries not to repeat lost games. It uses publicly available endgame databases.

Forum Posts


External Links

Chess Engine

Misc


References

  1. ^ New Winboard engine, SOS by Rudolf Huber, Germany ! by Frank Quisinsky, Winboard Forum, 27 October 1999
  2. ^ Support - ChessBase, May 28th, 2000
  3. ^ The new UCI / WB GUI Arena is available with UCI Arena SOS .. by Frank Quisinsky, CCC, January 18, 2002
  4. ^ Arena Chess GUI 3.0 - Partner Chess Engines
  5. ^ Arena Chess GUI 3.0 - SOS
  6. ^ Silicon on sapphire from Wikipedia.de
  7. ^ SOS' ICGA Tournaments

What links here?

Page Date Edited
Arena Mar 16, 2018
Bestia Jan 5, 2013
CCT3 Feb 14, 2013
CCT7 Dec 16, 2017
ChessBase Nov 25, 2017
Crux Jan 30, 2017
Delfi Jan 7, 2016
Eigenmann Endgame Test Jun 1, 2017
Engines Mar 10, 2018
George Lyapko Jan 14, 2013
ICT 2001 Oct 14, 2015
ICT 2002 Nov 19, 2016
IPCCC 1994 Jul 31, 2013
IPCCC 1997 Aug 24, 2013
IPCCC 1998 Feb 25, 2018
IPCCC 1999 Dec 21, 2012
IPCCC 2000 Dec 21, 2012
IPCCC 2001 Jan 9, 2014
IPCCC 2002 May 31, 2014
IPCCC 2003 Aug 17, 2016
IPCCC 2005 Aug 21, 2015
IPCCC 2005 b Apr 15, 2013
Mathematician Apr 9, 2018
MILLENNIUM 2000 GmbH Jul 13, 2017
Millennium Chess System Jul 12, 2017
ParSOS Jan 7, 2016
PocketGrandmaster Sep 17, 2015
Rudolf Huber Jan 7, 2016
Salvo Spitaleri Mar 11, 2013
SCCC 1998 Dec 15, 2017
SOS Apr 5, 2017
Stalemate Feb 21, 2018
Stefan Meyer-Kahlen Jun 19, 2017
Test-Positions Feb 25, 2018
Tony Hedlund Jun 19, 2017
UPCCC 1993 Mar 6, 2015
UPCCC 1994 Mar 9, 2012
WCCC 1995 Jul 12, 2017
WCCC 1999 Jul 13, 2017
WMCCC 1993 Dec 30, 2017
WMCCC 1997 Apr 4, 2017
WMCCC 2000 Feb 27, 2018

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