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ParSOS, (Parallel SOS)
the parallel version of Rudolf Huber's MTD(f) searcher SOS, written in C. ParSOS played the WMCCC 2001, WCCC 2002, WCCC 2003, WCCC 2004 and the WCCC 2006 World Microcomputer Chess and World Computer Chess Championships, the Chess960CWC 2005 and Chess960CWC 2006 Livingston Chess960 Computer World Championships, and the IPCCC 2004 and IPCCC 2007. According to a CCC discussion with Dieter Bürßner [1] and Vincent Diepeveen [2] involved, ParSOS uses a kind of ABDADA to parallelize MTD(f), utilizing a Shared Hash Table.

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WCCC 2003, Rudolf Huber and Steffen A. Jakob [3], round 4, ParSOS - Hossa [4]

[Event "WCCC 2003"]
[Site "Graz"]
[Date "2003.11.24"]
[Round "4"]
[White "ParSOS"]
[Black "Hossa"]
[Result "1-0"]

1.c4 e5 2.g3 Nf6 3.Bg2 d5 4.cxd5 Nxd5 5.Nf3 Nc6 6.O-O Nb6 7.Nc3 Be7 8.d3 O-O 
9.Be3 Be6 10.Rc1 Nd5 11.d4 exd4 12.Bxd4 Nxc3 13.Bxc3 Bxa2 14.Qa4 Be6 15.Rfd1 
Qc8 16.Nd2 Rd8 17.Nc4 Bd7 18.Ne3 Bg5 19.f4 Be7 20.Kh1 Bc5 21.Nd5 Bd6 22.Qc2 
Bf5 23.e4 Bg4 24.Rd2 Be6 25.e5 Bc5 26.Be4 Bxd5 27.Rxd5 Rxd5 28.Bxd5 Qd7 29.Rd1 
Rd8 30.Qe4 Kh8 31.f5 Qe7 32.Rf1 Nb4 33.f6 gxf6 34.Bb3 c6 35.Rf5 Nd5 36.Rh5 f5 
37.Qxf5 f6 38.exf6 1-0

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