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Cray Blitz (Computer)
Number of games in database: 6
Years covered: 1981 to 1993
Overall record: +2 -4 =0 (33.3%)*
   * Overall winning percentage = (wins+draws/2) / total games.

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(born 1980) United States of America

[what is this?]

It is the precursor to Crafty (Computer) and a successor of Blitz 5 (Computer). Its programmers are Robert Hyatt, Harry Nelson, and Albert Gower. It is written with Cray Assembly Language and FORTRAN and its roots draw mainly from the U of Southern Mississippi.

Wikipedia article: Cray Blitz

Last updated: 2018-11-27 04:21:03

 page 1 of 1; 6 games  PGN Download 
Game  ResultMoves YearEvent/LocaleOpening
1. J Sentef vs Cray Blitz 0-1551981Mississippi State ChampionshipA16 English
2. Cray Blitz vs Belle 0-1421981NACCCC58 Two Knights
3. Bobby vs Cray Blitz 1-05319865th World Computer ChampionshipC29 Vienna Gambit
4. Deep Thought vs Cray Blitz 1-04419896th World Computer ChampionshipA45 Queen's Pawn Game
5. Cray Blitz vs Deep Thought 0-1621991ACM AlbuquerqueB56 Sicilian
6. M-Chess vs Cray Blitz 0-151199323rd ACM Computer Chess Ch.C28 Vienna Game
  REFINE SEARCH:   White wins (1-0) | Black wins (0-1) | Draws (1/2-1/2) | Cray Blitz wins | Cray Blitz loses  

Kibitzer's Corner
May-13-05  Caissanist: Cray Blitz was the best chess program of the early eighties, and the first one to beat a master in a rated tournament. It was written by Robert Hyatt, who later came out with Crafty.
May-13-05  halcyonteam: Thanks, did not know it before.

I think latest crafty is 18.8+ right?

Or has the developement of crafty has stopped?

May-14-05  Caissanist: Hyatt's personal web page can be found at It lists Crafty as his primary current research interest, so I assume that he is continuing to develop it. The program is up to version 19.19 at least, with the most recent updates coming within the last few months.
Jul-11-05  fgh: Does anyone know where the game that he won against the master is avaible?
Jan-09-06  Caissanist: I don't have the game score, but I remember that it happened in the 1981 Mississippi State Championship. The computer beat Joseph Sentef, the defending champion and at the time Mississippi's only master. Sentef's loss gave the state championship to an expert who refused to play against the computer.
Jan-09-06  OJC: This is probably the game: from < How Computers Play Chess > by Levy and Newborn.

White: "Human" (U.S. master, rated 2262)
Black: Cray Blitz
Event: Mississippi State Championship, 1981
Slav Defense

1. c4 Nf6 2. Nc3 c6 3. Nf3 d5 4. cxd5 cxd5 5. d4 Nc6 6. g3 Ne4 7. Bg2 Nxc3 8. bxc3 e6 9. 0-0 Bd6 10. Qc2 0-0 11. Ng5 f5 12. f4 Na5 13. Qd3 Qd7 14. Bd2 Nc4 15. Bc1 Qa4 16. g4 h6 17. gxf5 hxg5 18. fxg5 Ba3 19. g6 Bxc1 20. Raxc1 Nd6 21. Qh3 Rxf5 22. Qh7+ Kf8 23. Qh8+ Ke7 24. Qxg7+ Kd8 25. Rxf5 Nxf5 26. Qf6+ Ne7 27. g7 Qe8 28. Bf3 Kd7 29. Rf1 Ng8 30. Bg2 Qe7 31. Qg6 Kd6 32. e4 dxe4 33. Bxe4 Qh4 34. Qg3+ Qxg3+ 35. hxg3 Bd7 36. Rf8 Rc8 37. Bh7 Rxc3 38. Rxg8 Rg3+ 39. Kf2 Rg5 40. Be4 b6 41. Ke3 e5 42. Ra8 Rg3+ 43. Kf2 Rxg7 44. dxe5+ Kxe5 45. Bf3 Be6 46. a4 Rf7 47. Ke3?? Rxf3+ 48. Kxf3 Bd5+ 49. Ke3 Bxa8 50. a5 Be4 51. Kd2 Kd4 52. Kc1 b5 53. Kb2 Kc4 54. a6 b4 55. Ka2 Kc3 (Cray blitz found mate in 6: 56. Ka1 Bc2 57. Ka2 b3+ 58. Ka3 b2 59. Ka2 b1=Q+ 60. Ka3 Qb2#) 0-1

Cray Blitz won all 5 of its games in the tournament for a performance rating of 2258.

Jan-10-06  Caissanist: Yes, that's it. As I remember it Sentef was very unhappy about the publicity surrounding his loss, which is probably why he is usually listed as "human" in the score of the game. Thanks for taking the time to type this in; I will submit it as a PGN to the site.
Dec-18-08  WhiteRook48: lol he only won 2 games
Jul-06-09  myschkin: . . .

Cheating in the World Computer Chess Championship [1986]

"...Let me [Sam Sloan in a team around Rex (Computer) ] just summarize by saying that Cray Blitz (Computer) did not deserve to win that tournament. The winner should have been the Hitech (Computer) program of Hans Berliner. ..."


Sample game:

Cray Blitz vs. HiTech, WCCC 1986
[Event "5th World Computer Chess Championship"]
[Site "Cologne, Germany"]
[Date "1986.06.15"]
[Round "5"]
[White "Cray Blitz"]
[Black "Hitech"]
[Result "1-0"]

1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 e6 5. Bxc4 c5 6. Qe2 a6 7. dxc5 Bxc5 8. O-O b5 9. Rd1 Qe7 10. Bd3 e5 11. e4 Nc6 12. Nc3 Bg4 13. Be3 Rd8 14. h3 Bxe3 15. Qxe3 Bxf3 16. Qxf3 Nd4 17. Qg3 O-O 18. a4 b4 19. Nd5 Nxd5 20. exd5 Rxd5 21. Bxa6 b3 22. Qe3 Rfd8 23. Bc4 Nc2 24. Qe2 Rc5 25. Rxd8+ Qxd8 26. Rb1 Nd4 27. Qf1 Qd7 28. Ra1 Qc6 29. Bb5 Nxb5 30. axb5 Qb7 31. Ra3 g6 32. Rxb3 Qd5 33. Rb4 Rc2 34. b3 Qd2 35. Rc4 Rb2 36. Re4 Qd5 37. Qc4 Qd1+ 38. Kh2 Rxf2 39. Rxe5 Qd6 40. Qc8+ Kg7 41. Qc5 Qd2 42. Rg5 Re2 43. Rg4 Qa2 44. Qc3+ Kg8 45. b6 Qa8 46. Qc7 Qf8 47. b7 Re8 48. Rc4 Kg7 49. Rc6 Rb8 50. Qc8 Rxc8 51. bxc8=Q Qb4 52. Qc7 Qxb3 53. Qe5+ Kh6 54. Qf4+ Kg7 55. Qd4+ Kh6 56. Rb6 Qc2 57. Qf4+ Kg7 58. Qf6+ Kh6 59. Qxf7 Qc8 60. Rd6 1-0

Nov-30-09  wbport: Being a chessplayer and programmer in Mississippi around 1980 I was quite interested in the Blitz program and its authors. I talked at length with Al Gower for my website:
Premium Chessgames Member
  Pawn and Two: <Caissanist & OJC> Please check your game score for Sentef vs Cray Blitz - Mississippi State Championship 1981.

Your game score indicates Sentef played 30.Bg2??, which allows 30...Nxf6. It seems unlikely that Sentef would have played 30.Bg2??, and Cray Blitz would not have missed taking the queen.

Instead of 30.Bg2??, Sentef probably played 30.Qg5, and then the game continuation of 30...Qe7 31.Qg6 is logical.

Nov-30-09  RandomVisitor: I can confirm the suspicions of <Pawn and Two>.

The book, Chess Skill in Man and Machine, 2nd edition, p.298, covers this game and reports white's 30th move as 30.Qg5.

Premium Chessgames Member
  Pawn and Two: Thank you, <RandomVisitor>. I will submit a request for a correction.
Oct-01-12  wbport: The website has changed from my Nov-30-09 post, it is now The old one will get you there, but may come down at any time (my former ISP).
Feb-04-17  wbport: Am paying for own site now:

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