Comet, a Chess Engine Communication Protocol compatible chess program by Ulrich Türke. Comet is written in C and therefor available for several platforms [1]. Comet played various over the board tournaments, Aegon Tournaments [2][3], three World Microcomputer Chess Championships, 1995, 1996 and 1997, multiple International Paderborn Computer Chess Championships, CCT Tournaments, and the ICT 2002.
Story of a Comet [4]

Screenshot

Comet DOS GUI [5]

Description

• design and implementation in 1991 originally guided by GNU Chess 3.0
• standard - search algorithm: Minimax + Alpha-Beta including "Aspiration-Window"; no minimal window search.
• good tactical strength by conventional extensions and threat detection by null-move heuristic
• use of a sophisticated, domain-dependent evaluation window technique
• considerable knowledge implemented in evaluation modules evaluation in 3 passes:
  1. scan and evaluation of pawn structure
  2. piece and king evaluation depending on the results of pass 1
  3. evaluation of global positional characteristics
• implementation of various classes of killer moves
• selectivity:
  a) Razoring , modified fail high reduction at depth 1
  b) null move search, partly with reduced search depth
  c) quiescence cut-offs as in GNU-Chess
• opening book with 120000 positions

Selected Games

[Event "WMCCC 1997"]
[Site "Paris, France"]
[Date "1997.11.02"]
[Round "11"]
[White "Comet"]
[Black "The Crazy Bishop"]
[Result "1-0"]
 
1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 e5 6.Ndb5 d6 7.Bg5 a6 8.Na3 Be7 
9.Bc4 O-O 10.Bxf6 Bxf6 11.Bd5 Rb8 12.O-O Nd4 13.Nc4 b5 14.Ne3 Bg5 15.Ne2 Bxe3 
16.fxe3 Ne6 17.Ng3 Qb6 18.Qd2 Nc7 19.Bb3 Be6 20.Nf5 Bxf5 21.Rxf5 Ne8 22.Raf1 
Nf6 23.Rxf6 gxf6 24.Rxf6 a5 25.Qf2 Kh8 26.Rh6 Rg8 27.Bxf7 Rg7 28.Bd5 Qd8 29.Rf6
Rc7 30.c3 b4 31.c4 a4 32.Qf5 Re7 33.Bf7 Qd7 34.Be6 Qd8 35.c5 Rg7 36.c6 a3 37.b3
Qe7 38.c7 Qxc7 39.Rf8+ Rg8 40.Bxg8 Rxf8 41.Qxf8 Qg7 42.Qxg7+ Kxg7 43.Bd5 1-0 

See also

• Astronomy

Forum Posts

1997 ...

• Comet A.75 in test by Jouni Uski, CCC, November 30, 1997
• Comet A 82 by Fernando Villegas, CCC, January 25, 1998
• Comet_against_Humans by Ulrich Türke, CCC, May 05, 1998
• Comet A90 by Thorsten Czub, CCC, May 16, 1998
• Comet A.90 on Winboard by Earl H. Castillo, CCC, August 15, 1998
• New Comet B02 Version! by Christian Goralski, CCC, May 30, 1999

2000 ...

• Paderborn : A "human" pawn sac by Comet ! by Côme, CCC, February 11, 2000 » IPCCC 2000
• Re: Comet B18 Whats new? by Ulrich Türke, CCC, March 24, 2000 » Passed Pawn, Bad bishop
• Comet B.31 by Dr. Ulrich Türke is available ! by Frank Quisinsky, CCC, March 10, 2001
• Paderborn Comet by Edward Seid, CCC, March 02, 2002 » IPCCC 2002
• xboard/Linux version of Comet B.46 available! by Leo Dijksman, CCC, June 10, 2002
• Comet B48 under Chess Partner 5.2 by Shaun Brewer, CCC, September 13, 2002
• Re: Comet 62b, where I look for it? by Ulrich Türke, CCC, October 21, 2003
• Testposition from Comet-The Baron by Richard Pijl, CCC, February 15, 2004 » The Baron, IPCCC 2004
• Re: Comet B68 a little question... by Ulrich Türke, CCC, March 21, 2004

2005 ...

• What happened to Comet? by Fernando Villegas, CCC, December 16, 2005
• OT - Comet 17P Holmes by Charles Roberson, CCC, October 31, 2007 » Holmes ^[8]
• A Propos "Comet" by Fernando Villegas, CCC, October 13, 2009

2010 ...

• Comet B15, Amy 0.6 Green Light Chess 2.07a available ... by Frank Quisinsky, CCC, February 04, 2010 » Amy, Green Light Chess
• More about Comet B68 by Fernando Villegas, CCC, August 06, 2011

External Links

Chess Engine

• Comet's ICGA Tournaments
• Comet from WBEC Ridderkerk
• Index of /chess/engines/Norbert's collection/Comet (Compilation) by Norbert Raimund Leisner, hosted by Kirill Kryukov
• Comet B68 in CCRL 40/40

Comet

• Comet (disambiguation) from Wikipedia
• Comet from Wikipedia
  Great Comet from Wikipedia
  Comet nucleus from Wikipedia
  Coma (cometary) from Wikipedia
  Comet tail from Wikipedia
• Lists of comets from Wikipedia
  Comet Holmes from Wikipedia
  Halley's Comet from Wikipedia
• Bill Haley & His Comets - Hot Dog Buddy Buddy, from Don't Knock the Rock (1956), YouTube Video
  

References

1. ^ Comet from WBEC-Ridderkerk
2. ^ CSVN Aegon 1996 site
3. ^ CSVN Aegon 1997 site
4. ^ Story of a Comet by Luis Ricardo Falero, before 1897, Oil on canvas, Wikimedia Commons
5. ^ Septober - Computerschach by Herbert Marquardt
6. ^ Comet's ICGA Tournaments
7. ^ Paris 1997 - Chess - Round 11 - Game 6 (ICGA Tournaments)
8. ^ Comet Holmes from Wikipedia

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