Changes

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 [[GUI|graphical user interface]]. SOS supported the [[Chess Engine Communication Protocol]] <ref>[http://www.open-aurec.com/wbforum/viewtopic.php?f=18&t=30441 New Winboard engine, SOS by Rudolf Huber, Germany !] by [[Frank Quisinsky]], [[Computer Chess Forums|Winboard Forum]], 27 October 1999</ref> , was available as [[ChessBase#YoungTalents|Young Talent]] by [[ChessBase]] running under the [[Fritz#FritzGUI|Fritz6 GUI]] <ref>[http://www.chessbase.com/support/support.asp?pid=100 Support - ChessBase, May 28th, 2000]</ref> , and since Rudolf is co-designer of the protocol, it finally changed to [[UCI]] <ref>[https://www.stmintz.com/ccc/index.php?id=208295 The new UCI / WB GUI Arena is available with UCI Arena SOS ..] by [[Frank Quisinsky]], [[CCC]], January 18, 2002</ref> , and is a ''Partner Chess Engine'' of [[Arena]] <ref>[http://www.playwitharena.com/?Partner_Chess_Engines Arena Chess GUI 3.0 - Partner Chess Engines]</ref> <ref>[http://www.playwitharena.com/?Partner_Chess_Engines:SOS%26nbsp%3B Arena Chess GUI 3.0 - SOS]</ref> . SOS evolved from [[Principal Variation Search|PVS]] to [[MTD(f)]] and further as [[ParSOS]] to [[Parallel Search|parallel]] MTD(f).