a private chess engine by Vincent Diepeveen, written in C. The development started in 1994, and so far stopped in December 2012 . Since 1999 Diep performed a parallel search on SMP, and later on NUMA multi core systems, and occasionally on Super Computers but unfortunately without too much support for testing. Diep's most successful year was 2004, when Diep won the Dutch Open Computer Chess Championship in 2004 , and won the Bronze Medal at the WCCC in Ramat Gan . Diep spawns processes for its parallel search. Due to its enormous chess knowledge implemented in its evaluation, Diep was not a fast but knowledge based searcher.
In 1997, Vincent Diepeveen's early claim caused some trouble and antagonism    :
Diep is without doubt the strongest chess analysis program in the world at infinite level (few hours a move). The longer you allow it to analyse the better the move it will produce, something which is uncommon for most other chessprograms, caused by the enormeous chessknowledge in Diep, which is at the time still considerably growing every month (and decreasing the Diep searchspeed).
Diep was one of the most active programs in official tournaments. It played three World Microcomputer Chess Championships, the WMCCC 1997  , WMCCC 2000 and WMCCC 2001, seven World Computer Chess Championships, WCCC 1999, WCCC 2002, WCCC 2003  , WCCC 2004, WCCC 2005, WCCC 2006 and the WCCC 2007, various Dutch Open Computer Chess Championships, ICTs , IPCCCs, the IOPCCC 2007, CPTs and CCT Tournaments.
Diep, while playing tournaments, had various book authors over the time, Carlos Pesce at the WMCCC 2001, Eros Riccio at the WCCC 2006, and Arturo Ochoa at most other tournaments.
given from the ICGA tournament site 
Diep is a classical chess playing program with this exception that I try to incorporate as much chess knowledge as possible. This is hard work, but in the end I hope it will give Diep a lot.
Started winter 1994 with DIEP. But now i'm busy with this experimental parallel program, it's called DIEP. Still using the same huge evaluation, from which as far as i know it's the most extensive chess evaluation that any chessprogram contains (although mainly middlegame/opening heuristics).
The search of DIEP is however very very selective currently. I plan to join Paderborn with a complete new search. Not only parallel, but it's closer to best first search than the depth limited alfabeta search, although it's still using the iteration to expand nodes.
WCCC 2004, round 10, Fritz - Diep  
[Event "WCCC 2004"] [Site "Ramat Gan, Israel"] [Date "2004.07.12"] [Round "10"] [White "Fritz"] [Black "Diep"] [Result "0-1"] 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Be3 e5 7.Nb3 Be6 8.f3 Nbd7 9.g4 b5 10.g5 b4 11.Ne2 Nh5 12.Qd2 a5 13.Ng3 Nxg3 14.hxg3 a4 15.Nc1 Qa5 16.f4 Nc5 17.Bg2 a3 18.b3 Rc8 19.f5 Bd7 20.Nd3 Nxd3+ 21.cxd3 Qb5 22.d4 Be7 23.d5 Bd8 24.Bf1 Qb7 25.Bc4 Rb8 26.O-O-O Bb6 27.Kb1 Qa7 28.Bxb6 Qxb6 29.Rc1 Kf8 30.Rc2 Qd4 31.Qe2 Rc8 32.g6 h5 33.g4 h4 34.Qf3 f6 35.Rd1 Qb6 36.Rh2 Ke7 37.g5 fxg5 38.Re2 Rh6 39.Qg4 Kf6 40.Qg2 Bb5 41.Rg1 Rh5 42.Bxb5 h3 43.Qg4 Qxb5 44.Rd2 Qc5 45.Rgd1 Rh4 46.Qg3 Qc3 47.Qh2 Qe3 48.Re2 Qf3 0-1
- Eric van Reem (2004). Drei Gewinner in Leiden - Die Geschichte von Diep. Computerschach und Spiele, 6/2004 (German) » DOCCC 2004
- Diep homepage by Vincent Diepeveen, rgcc, November 19, 1996
- Endgame Study Solving Competition by Harold van der Heijden, rgcc, December 13, 1996
- Unsubstantiated claim in the Diep homepage by Bruce Moreland, rgcc, January 17, 1997
- The Diep Home page (more correction needed) by Ed Schröder, rgcc, January 21, 1997
- The Diep Advanced Intelligence chess program by Jan-Frode Myklebust, CCC, April 20, 1998
- DIEP parallel in Paderborn - technical and detailed story by Vincent Diepeveen, CCC, June 28, 1999
- DIEP in WMCCC2000 London - long story by Vincent Diepeveen, CCC, August 29, 2000
- DIEP would have won from Kasparov on the board by Vincent Diepeveen, CCC, March 02, 2001
- Vincent (Diep) chessbench makes the news again by K. Burcham, CCC, December 09, 2001
- An interesting forward pruning experiment - with pseudo description by Vincent Diepeveen, rgcc, February 08, 2003
- Diep as a strong sparring opponent (longish)? by Đorđe Vidanović, CCC, October 13, 2003 » Ruffian
- 64 bits report on diep by Vincent Diepeveen, CCC, June 30, 2004
- Diep move generator speeded up by Vincent Diepeveen, CCC, January 01, 2005
- diep's inferior evaluation by Uri Blass, CCC, June 12, 2007
- Diep tested on latest AMD and Intel processors by Vincent Diepeveen, CCC, March 31, 2008
- Pretty move by Diep by Dann Corbit, CCC, May 11, 2009 » WCCC 2004, Fritz - Diep
- Diep? by Zach Wegner, CCC, February 20, 2010 » CCT12
- ICGA rule #2 / opening books / Diep-Crafty, Turino 2006 by Peter Berger, CCC, October 22, 2011 » Opening Book, WCCC 2006
- Diepeveen's move generator by Hrvoje Horvatic, CCC, November 18, 2012 » Table-driven Move Generation
- DIEP chess engine ever made public? by Cliff Sears, CCC, September 30, 2014
- Diep 2.0 by Brendan J. Norman, CCC, January 26, 2018
- Re: Diep 2.0 by Vincent Diepeveen, CCC, January 26, 2018
- Vincent Diepeveen en het schaakprogramma Diep from Schaakclub Oud Zuylen Utrecht (Dutch)
- Diep lachende derde in het NK en Kramnik versus de witte-boorden-maffia by Vincent Diepeveen, Schaakclub Oud Zuylen Utrecht (Dutch)
- Super Diep by Vincent Diepeveen, Schaakclub Oud Zuylen Utrecht (Dutch)
- Permission to use code from Random thoughts by Mridul Muralidharan, June 09, 2004 » Diep's Table-driven Move Generation
- Diep's ICGA Tournaments
- The chess games of Diep from chessgames.com
- Diep from Internet Chess Club
- ↑ Diep in Polen by Vincent Diepeveen, Schaakclub Oud Zuylen Utrecht (Dutch)
- ↑ Re: Diep 2.0 by Vincent Diepeveen, CCC, January 26, 2018
- ↑ Diep Nederlands kampioen 2004! by Vincent Diepeveen, Schaakclub Oud Zuylen Utrecht (Dutch)
- ↑ Diep derde op het WK 2004! by Vincent Diepeveen, Schaakclub Oud Zuylen Utrecht (Dutch)
- ↑ Unsubstantiated claim in the Diep homepage by Bruce Moreland, rgcc, January 17, 1997
- ↑ Let's stop wasting time on Vincent Diepeveen by Dap Hartmann, rgcc, January 23, 1997
- ↑ Peter Kouwenhoven (1997). DIEP, Deep Trouble. ICCA Journal, Vol. 20, No. 3, pp. 200-203
- ↑ Diep in Parijs by Vincent Diepeveen, Schaakclub Oud Zuylen Utrecht (Dutch)
- ↑ Super Diep by Vincent Diepeveen, Schaakclub Oud Zuylen Utrecht (Dutch)
- ↑ Diep's ICGA Tournaments
- ↑ Re: Null move? post 4 by Vincent Diepeveen, rgcc, October 11, 1997
- ↑ Permission to use code from Random thoughts by Mridul Muralidharan, June 09, 2004
- ↑ Diep move generator speeded up by Vincent Diepeveen, CCC, January 01, 2005
- ↑ Re: What's the fastest move generator? by Vincent Diepeveen, CCC, August 30, 2012
- ↑ Ramat-Gan 2004 - Chess - Round 10 - Game 3 (ICGA Tournaments)
- ↑ Pretty move by Diep by Dann Corbit, CCC, May 11, 2009