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Nebula, (Nebula Chess)
an UCI compliant chess engine by Dragan Zdravkovic, first released in November 2012. Nebula features Chess960 and can probe Nalimov Tablebases with up to five pieces. Nebula had a great tournament debut at the CCT15 with 4½ / 7 and 6th place out of 24, and further participated at TCEC Season 5.


Nebula, apparently a bitboard engine applying the SSE4 popcnt instruction [2], is able to search in parallel on up to 16 processors. Selectivity is achieved through null move pruning, late move reductions, futility pruning and since Version 2.0, singular extensions [3]. The basic evaluation considers material, mobility, passed pawns and king safety, and subsequently piece-square tables, isolated, doubled, and backwards pawns, pawn storms, candidates, and rook on open/semi-open files and 7th rank [4].

Selected Games

CCT15, round 2, Nebula - Hannibal [5]

[Event "CCT15"]
[Site "Variant-ICS, Amsterdam, NL"]
[Date "2013.02.23"]
[Round "2"]
[White "Nebula"]
[Black "Hannibal"]
[Result "1/2-1/2"]

1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 g6 5.Nc3 Bg7 6.Be3 Nf6 7.Bc4 O-O 8.Bb3 d6 9.f3 Bd7 10.Qd2 Nxd4 
11.Bxd4 b5 12.a4 b4 13.Nd5 Nxd5 14.exd5 Bxd4 15.Qxd4 a5 16.O-O Qc7 17.Rfe1 Rfe8 18.Re2 Qa7 19.Qxa7 
Rxa7 20.Rae1 Kf8 21.g4 Rc7 22.Kf2 Bc8 23.Re4 Ba6 24.h4 h5 25.gxh5 gxh5 26.Rg1 f6 27.Ke3 Rec8 28.Rg2 
Bc4 29.Bxc4 Rxc4 30.Kd3 R4c5 31.Rd4 Kf7 32.f4 f5 33.Rg5 Rxc2 34.Rxf5+ Kg8 35.Rg5+ Kf8 36.Rf5+ Ke8 
37.Rxh5 R8c5 38.Rh8+ Kd7 39.b3 R2c3+ 40.Ke4 Rxb3 41.Kf5 Rbc3 42.h5 b3 43.Rd2 R5c4 44.Rb8 Kc7 45.Re8 
Rc2 46.Rxe7+ Kb6 47.Rd1 b2 48.Rb1 Rf2 49.Re4 Rc1 50.Re1 Rc4 51.Re4 Rc1 52.Re1 Rc4 53.Re4 1/2-1/2

See also

Forum Posts

External Links

Chess Enginee


McCoy Tyner, Azar Lawrence, Juney Booth, Alphonse Mouzon


  1. Composed of gas and dust, the pictured pillar resides in a tempestuous stellar nursery called the Carina Nebula, located 7500 light-years away in the southern constellation of Carina, Hubble's Wide Field Camera 3 observed the Carina Nebula on July 24-30, 2009. The composite image was made from filters that isolate emission from iron, magnesium, oxygen, hydrogen and sulphur, September 09, 2009, source: HubbleSite - NewsCenter - Hubble Opens New Eyes on the Universe (09/09/2009) - Release Images, Author: NASA, ESA, and the Hubble SM4 ERO Team. Nebula from Wikipedia
  2. Re: Nebula 1.0 released by Dragan Zdravkovic, CCC, December 01, 2012
  3. Re: Nebula 2.0 released by Dragan Zdravkovic, CCC, March 13, 2013
  4. Nebula Chess
  5. CCT15 Results, Download (Wayback Machine)

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