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Home * Engines * Ktulu

Artist depiction of Ktulu [1]

a commercial UCI and WinBoard compatible chess engine by Rahman Paidar distributed by Lokasoft, but as of July 2020 no longer available [2]. Ktulu has a sophisticated evaluation - King safety and passed pawn evaluation, completely rewritten in version 6.2, are responsible for its dangerous attacking style with strong tactical and positional play. Further, some unsafe pruning algorithms were replaced with more sound methods [3]. The first version of Ktulu was written in early 2002 in Turbo Pascal under MS-DOS. The development of the Windows version started in summer 2002 [4].

Tournament Play

Ktulu played four CSVN tournaments over the board, the Leiden DOCCC 2005, DOCCC 2008, ICT 2009 and DOCCC 2009, operated by Hans Secelle. Ktulu furher participated at the CCT10, CCT11 and CCT12 online tournaments, and the WCRCC 2007 - the first ACCA World Computer Rapid Chess Championship.

Photos & Games

Ktulu - Hermann


ICT 2009, Volker Annuss and Hans Secelle, Ktulu - Hermann

[Event "ICT 2009"]
[Site "Leiden, NED"]
[Date "2009.06.05"]
[Round "4"]
[White "Ktulu 9"]
[Black "Hermann 2.4.24"]
[Result "1-0"]

1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Bg5 e6 7.f4 Qb6 8.Qd2 Qxb2 9.Rb1 Qa3 
10.e5 dxe5 11.fxe5 Nfd7 12.Be2 Qa5 13.Nb3 Qc7 14.O-O Nxe5 15.Bh5 Nbc6 16.Ne4 Ba3 17.Qe3 
Be7 18.Qg3 g6 19.Nf6+ Bxf6 20.Bxf6 Rg8 21.Be2 Qb8 22.Qh4 Nd7 23.Bc3 h5 24.Rbd1 Qa7+ 
25.Rf2 Qe3 26.Rd3 Qh6 27.Nd2 f5 28.Nc4 Rg7 29.Nd6+ Kf8 30.Bf3 Re7 31.Bxc6 bxc6 32.Rfd2 
c5 33.Nxc8 Rxc8 34.Rxd7 Qe3+ 35.Kf1 g5 36.Qxh5 Qf4+ 37.Ke2 Qe4+ 38.Kd1 Qg4+ 39.Qxg4 fxg4 
40.Bf6 Rxd7 41.Rxd7 Rb8 42.Rd8+ Rxd8+ 43.Bxd8 Kf7 44.Bxg5 Kg6 45.Be7 Kf5 46.Bxc5 Ke4 
47.h4 gxh3 48.gxh3 Kf5 49.h4 e5 50.Bb6 Ke6 51.h5 Kf6 52.h6 1-0

Ktulu - Deep Sjeng


DOCCC 2009, Ktulu - Deep Sjeng, Gian-Carlo Pascutto and Hans Secelle with Computer Chess Compendium

[Event "DOCCC 2009"]
[Site "Leiden NED"]
[Date "2009.10.18"]
[Round "8"]
[White "Ktulu"]
[Black "Deep Sjeng"]
[Result "0-1"]

1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Bg5 Nbd7 7.Bc4 e6 8.O-O Ne5 9.Be2 Be7 
10.f4 Ng6 11.f5 Ne5 12.fxe6 fxe6 13.Bh5+ g6 14.Be2 O-O 15.Qd2 Bd7 16.Kh1 Nf7 17.Be3 b5 
18.a3 Qc7 19.Rf2 Rac8 20.Raf1 Qd8 21.Qd3 Ne5 22.Qd1 Re8 23.Bh6 Rxc3 24.bxc3 Nxe4 25.R2f4 
Nf6 26.R4f2 d5 27.Nb3 Nf7 28.Bc1 Nd6 29.R2f3 Nfe4 30.Bf4 Qc8 31.Be5 Ng5 32.Qc1 Nf5 33.g4 
Nh6 34.R3f2 Nhf7 35.R2xf7 Nxf7 36.Rxf7 Kxf7 37.Qh6 Rf8 38.Qxh7+ Ke8 39.Qxg6+ Kd8 40.Nd4 
Re8 41.Bd3 Bf8 42.Qh7 Be7 43.Qh6 Qc5 44.Nxe6+ Bxe6 45.Qxe6 Bh4 46.Qf5 Qf8 47.Qxf8 Rxf8 
48.Kg2 Be7 49.Kg3 Kd7 50.Bf4 Bxa3 51.h4 Bb2 52.g5 Bxc3 53.h5 Kc6 54.h6 a5 55.g6 a4 56.g7 
Rg8 57.Bh7 Bxg7 58.Bxg8 Bc3 59.Bf7 a3 60.Be8+ Kc5 61.Be3+ Kd6 62.Bxb5 a2 0-1


Forum Posts



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External Links

Chess Engine


Cthulhu Mythos

Call of Cthulhu

Delta Green from Wikipedia


  1. An artist's visual representation of the Elder God Cthulhu, by BenduKiwi, July 30, 2006, Wikimedia Commons
  2. Ktulu from Lokasoft (as of July 2020, no longer available)
  3. Ktulu 6.2 will be released soon, Interview with Rahman Paidar by Frank Quisinsky, Arena News-Ticker 80, March 15, 2005 (Wayback Machine)
  4. Klaus Wlotzka (2006). Ktulu 8 - Interview mit Rahman Paidar. CSS Online, pdf (German)

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