Walter Browne - Chess 4.6 (1978)

Chess 4.6 (authors: David Slate and Larry Atkin) gets a victory against a grandmaster in this simultaneous exhibition from 1978, as reported in the July 1978 issue of Chess Life and Review.

U.S. Champion Browne played 44 games at once, one of which was against Chess 4.6. GM Browne's tour "had thus far produced an amazing winning streak, with only 2 losses and 6 draws in 17 exhibitions."

Chess 4.6 was running on a Control Data Corporation Cyber 176.

"In the course of this simul, CHESS 4.6 correctly projected 35 of Browne's 58 moves, not including those from the opening library. The largest number of positions examined for any one move was 2,158,456 in just over 9 minutes [2158456/9.1/60 = 3953 nodes/ sec] . In total, CHESS 4.6 used just over 4 hours of computation time, whereas GM Browne spent 26 minutes at the board."

[Event "Minnesota Twin Cities Open Simul"]

[Site "Minnesota Twin Cities Open"]

[Date "1978.??.??"]

[Round "Simul"]

[White "Walter Browne"]

[Black "Chess 4.6 Cyber 176"]

[Result "0-1"]

[BlackElo "1936"]

[WhiteElo ""]

[PlyCount "126"]

1. d4 Nf6 2. c4 c5 3. Nf3 cxd4 4. Nxd4 e5 5. Nb5 Bc5 6. N1c3 O-O 7. e3 d6 8. Be2 a6 9. Na3 Nc6 10. Nc2 Bf5 11. O-O Qd7 12. b3 Kh8 13. Bb2 Rg8 14. Na4 Ba7 15. Ba3 h6 16. Rc1 Rad8 17. Nb4 Nxb4 18. Bxb4 Qc7 19. Qe1 Bc5 20. Bf3 Bd3 21. Bxc5 dxc5 22. Be2 Bf5 23. f3 e4 24. f4 Bd7 25. Nc3 Qa5 26. Qh4 Bc6 27. Rc2 b5 28. g4 b4 29. Nd1 Rd6 30. Nf2 Rgd8 31. Rd1 Rxd1 32. Bxd1 Rd6 33. Qg3 Qd8 34. Rc1 Rd2 35. g5 hxg5 36. fxg5 Nh7 37. g6 fxg6 38. Qxg6 Qh4 39. Qf5 Bd7 40. Qf4 Qxf4 41. exf4 e3 42. Ne4 e2 43. Bxe2 Rxe2 44. Nxc5 Bc8 45. Rd1 Re8 46. a3 bxa3 47. Ra1 g5 48. fxg5 Re5 49. b4 a5 50. Nd3 Rxg5 51. Kf2 axb4 52. Nxb4 Ra5 53. Ke3 Be6 54. Kd4 Ng5 55. Nc2 a2 56. Nb4 Ra4 57. Kc5 Ne4 58. Kb5 Bd7 59. Nc6 Nc3 60. Kc5 Bxc6 61. Kxc6 Rxc4 62. Kd6 Rd4 63. Ke5 Rd1 0-1

(1) Walter Browne - Chess 4.6 Cyber 176 (1936) Minnesota Open Simul Minnesota Open, 1978

[Rybka 2.3.2a] 3 minutes per move Quad core Intel at 3.2GHz

1.d4 Nf6 2.c4 c5 3.Nf3 cxd4 4.Nxd4 e5 5.Nb5 Bc5 last book move

6.N1c3 -0.07/18 0–0 -0.07/17

7.e3= -0.16/17

[Rybka 2.3.2a: 7.a3 a6 8.Nd6 Qb6 9.Nce4 Nxe4 10.Nxe4 Be7 11.Nc3 Qg6 12.Be3 Nc6 13.Nd5 Bg5= -0.07/17 ]

7...d6 -0.16/18

8.Be2 -0.31/18

[Rybka 2.3.2a: 8.Na4 Bd7 9.Nxc5 dxc5 10.Be2 Qb6 11.0–0 Rd8 12.Qb3 Nc6 13.Rd1 Bg4 14.f3 Rxd1+= -0.16/18 ]

8...a6 -0.31/20

9.Na3 -0.31/18 Nc6 -0.31/16

10.Nc2 -0.52/17

[Rybka 2.3.2a: 10.0–0 Be6 11.Nab1 Rc8 12.b3 d5 13.cxd5 Nxd5 14.Nxd5 Bxd5 15.Nc3 Be6 16.Bb2 Qa5 -0.31/16 ]

10...Bf5 -0.31/18

[Rybka 2.3.2a: 10...Be6 11.0–0 d5 12.cxd5 Nxd5 13.Nxd5 Bxd5 14.Qd3 Be6 15.Qc3 Qb6 16.b3 Rac8 17.Bb2 -0.52/17 ]

11.0–0 -0.35/16 Qd7 -0.25/17

12.b3 -0.25/16 Kh8= -0.07/18

[Rybka 2.3.2a: 12...Rfd8 13.Nd5 Nxd5 14.cxd5 Ne7 15.Bf3 Rdc8 16.e4 Bg6 17.Qd3 f5 18.Be3 Qb5 19.Qxb5= -0.25/16 ]

13.Bb2 -0.08/16 Rg8= -0.04/17

[Rybka 2.3.2a: 13...Rac8 14.Bd3 h6 15.Qd2 Kg8 16.f3 Rc7 17.Rad1 Rd8 18.Bxf5 Qxf5 19.Qd3 Qg5 20.Rf2= -0.08/16 ]

14.Na4= -0.10/17

[Rybka 2.3.2a: 14.Bd3 Rac8 15.Nd5 Nxd5 16.cxd5 Bxd3 17.Qxd3 Ne7 18.Rac1 f5 19.g3 Rgf8 20.b4 Ba7= -0.04/17 ]

14...Ba7= -0.03/17

[Rybka 2.3.2a: 14...Rad8 15.Bf3 Rge8 16.Nxc5 dxc5 17.Qxd7 Rxd7 18.Bxc6 bxc6 19.Ne1 Kg8 20.Ba3 Rd2 21.Bxc5= -0.10/17 ]

15.Ba3= -0.24/17

[Rybka 2.3.2a: 15.Nc3 Rac8 16.Bd3 e4 17.Be2 Rgd8 18.Na4 h6 19.Nd4 Ne5 20.Bc3 Bg4 21.Ba5 Bxe2= -0.03/17 ]

15...h6= -0.12/19

[Rybka 2.3.2a: 15...d5 16.c5 Rgd8 17.Bd3 Kg8 18.Nb4 Rac8 19.Nxc6 Rxc6 20.f3 e4 21.Bc2 Bg6 22.Rf2= -0.24/17 ]

16.Rc1 -0.12/18 Rad8= 0.01/19

[Rybka 2.3.2a: 16...Rgd8 17.Nb4 Ne7 18.Bb2 a5 19.Nd5 Nexd5 20.cxd5 Rab8 21.Bd3 b5 22.Nc3 Rdc8 23.Bxf5= -0.12/18 ]

17.Nb4 0.00/18 Nxb4 -0.04/14

18.Bxb4 0.00/17 Qc7 0.01/17

19.Qe1 0.00/17 Bc5= 0.16/19

[Rybka 2.3.2a: 19...Rge8 20.Nc3= 0.00/17 ]

20.Bf3= -0.19/20

[Rybka 2.3.2a: 20.Bc3 Ba7 21.Ba5 b6 22.Bb4 Qc6 23.Nc3 Rge8 24.Qd2 a5 25.Ba3 d5 26.cxd5 Nxd5= 0.16/19 ]

20...Bd3 -0.19/21

21.Bxc5 -0.18/17 dxc5 -0.19/17

22.Be2 -0.20/19 Bf5= -0.12/21

[Rybka 2.3.2a: 22...e4 23.Rd1 b5 24.Nb2 Bxe2 25.Qxe2 Qe5 26.Rb1 b4 27.Rfd1 Kh7 28.Na4 Qc7 29.h3= -0.20/19 ]

23.f3 -0.12/18 e4 -0.12/20

24.f4 -0.12/19 Bd7 -0.12/21

25.Nc3 -0.10/18 Qa5= 0.03/21

[Rybka 2.3.2a: 25...Bc6 26.Rd1 Kh7 27.Rxd8 Rxd8 28.Qb1 Qa5 29.Qc2 g6 30.Rd1 Rxd1+ 31.Bxd1 b5 32.Qd2= -0.10/18 ]

26.Qh4= -0.13/18

[Rybka 2.3.2a: 26.Rc2 Bc6 27.Na4 Qb4 28.Qxb4 cxb4 29.Nb6 g6 30.Kf2 g5 31.Kg1 gxf4 32.Rxf4 Rg6= 0.03/21 ]

26...Bc6 -0.12/18

27.Rc2= -0.20/20

[Rybka 2.3.2a: 27.g4 Rd6 28.g5 Nh7 29.Qg3 Rgd8 30.Bg4 Qc7 31.h4 b5 32.Bf5 Qe7= -0.12/18 ]

27...b5= 0.00/19

[Rybka 2.3.2a: 27...Rd6 28.Rd1 Rxd1+ 29.Nxd1 Rd8 30.Kf1 Qc7 31.Nc3 Kh7 32.Rc1 b6 33.Kg1 Kg8 34.Qe1= -0.20/20 ]

28.g4= -0.13/19

[Rybka 2.3.2a: 28.cxb5 axb5 29.Rfc1 b4 30.Nd1 Ba8 31.Qe1 Qa7 32.Rxc5 Qxa2 33.R5c2 Qxb3 34.Rb2 Qe6= 0.00/19 ]

28...b4= 0.00/21

[Rybka 2.3.2a: 28...Rd3 29.cxb5 axb5 30.Rfc1 c4 31.bxc4 bxc4 32.Nd1 Rd2 33.Qe1 Rxc2 34.Qxa5 Rxc1 35.Qd2= -0.13/19 ]

29.Nd1 -0.32/20

[Rybka 2.3.2a: 29.g5 bxc3 30.gxf6 Kh7 31.fxg7 Rxg7+ 32.Kh1 Rd2 33.Qf6 Rxc2 34.Qf5+ Kh8 35.Qc8+ Kh7= 0.00/21 ]

29...Rd6= -0.22/21

[Rybka 2.3.2a: 29...Qc7 30.Nf2 Nh7 31.Qh5 Qe7 32.Nh1 Rd7 33.Ng3 Rgd8 34.Nf5 Qe8 35.g5 hxg5 36.fxg5 -0.32/20 ]

30.Nf2 -0.22/20 Rgd8 0.27/20

[Rybka 2.3.2a: 30...Qd8 31.Rcc1 Qe7 32.Rcd1 Rgd8 33.Rxd6 Rxd6 34.Rd1 Rxd1+ 35.Bxd1 Kg8 36.Qg3 Qd8 37.g5= -0.22/20 ]

31.Rd1= -0.21/20

[Rybka 2.3.2a: 31.g5 Ng8 32.f5 Qc7 33.Ng4 f6 34.gxh6 gxh6 35.Nxh6 Qg7+ 36.Ng4+ Qh7 37.Qg3 Ne7 0.27/20 ]

31...Rxd1+= -0.01/23

[Rybka 2.3.2a: 31...Qc7 32.Rxd6 Rxd6 33.Nh1 Kh7 34.g5 Ng8 35.Nf2 f5 36.gxf6 Nxf6 37.Ng4 Nxg4 38.Bxg4= -0.21/20 ]

32.Bxd1 -0.07/21 Rd6= 0.00/22

[Rybka 2.3.2a: 32...Qc7 33.g5 Ng8 34.Bg4 Qd6 35.Kg2 f6 36.Rc1 Qe7 37.Rd1 a5 38.g6 Rxd1 39.Nxd1= -0.07/21 ]

33.Qg3 -0.28/20

[Rybka 2.3.2a: 33.g5 Ng8 34.Be2 f5 35.gxf6 Nxf6 36.Ng4 Qd8 37.Ne5 Be8 38.Bf1 Rd1 39.Re2 Qd6= 0.00/22 ]

33...Qd8 -0.28/22

34.Rc1 -0.35/20 Rd2 -0.35/18

35.g5 -0.52/21

[Rybka 2.3.2a: 35.Bc2 Qe7 36.Kf1 Ne8 37.g5 f5 38.Ke1 Rd6 39.Rd1 Kh7 40.h4 hxg5 41.Qxg5 Qf7 -0.35/18 ]

35...hxg5 -0.53/21

36.fxg5 -0.54/21 Nh7 -0.54/19

37.g6 -0.75/22

[Rybka 2.3.2a: 37.h4 f6 38.gxf6 Nxf6 39.Ra1 Bd7 40.h5 Be6 41.Kf1 Rb2 42.Be2 Qd2 43.Re1 Bf7 -0.54/19 ]

37...fxg6 -0.76/20

38.Qxg6 -0.77/20 Qh4 -0.77/20

39.Qf5?? –+ -3.78/22

[Rybka 2.3.2a: 39.Qg3 Qxg3+ 40.hxg3 Rxa2 41.Bg4 Nf6 42.Rd1 Kg8 43.Be6+ Kf8 44.Rd6 Be8 45.g4 Ra1+ -0.77/20 ]

39...Bd7? –+ -2.25/26

[Rybka 2.3.2a: 39...Ng5 40.Qf8+ Kh7 41.Kf1 Bd7 42.Rc2 Bh3+ 43.Ke1 Nf3+ 44.Qxf3 exf3 45.Rxd2 Bg2 46.Bc2+ –+ -3.78/22 ]

40.Qf4 -2.25/25 Qxf4 -2.28/28

41.exf4 -2.32/25 e3 -2.32/28

42.Ne4 -2.26/26 e2 -1.71/22

43.Bxe2 -2.31/26 Rxe2 -2.29/25

44.Nxc5 -2.24/23 Bc8 -0.96/23

[Rybka 2.3.2a: 44...Bh3 45.Rd1 Rg2+ 46.Kh1 Rxa2 47.Rd8+ Nf8 48.Rxf8+ Kh7 49.Kg1 Rg2+ 50.Kf1 Rg5+ 51.Kf2 –+ -2.24/23 ]

45.Rd1 -0.89/24 Re8 -0.89/22

46.a3 –+ -1.78/25

[Rybka 2.3.2a: 46.Nd3 a5 47.Ne5 Nf6 48.c5 Nh5 49.Nf7+ Kg8 50.Nd6 Rd8 51.Rd4 Kf8 52.Kf2 Nf6 -0.89/22 ]

46...bxa3 -1.74/23

47.Ra1 -1.61/21 g5 -1.42/21

48.fxg5 -1.42/21 Re5 -1.34/19

49.b4 –+ -2.54/21

[Rybka 2.3.2a: 49.Nd3 Rxg5+ 50.Kf2 Ra5 51.Ke3 Ng5 52.b4 Ra4 53.Ra2 Be6 54.Kd4 Bf5 55.Kc3 Bxd3 -1.34/19 ]

49...a5 -2.54/22

50.Nd3 -2.54/22 Rxg5+ -2.23/25

51.Kf2 -2.09/22 axb4 -2.09/23

52.Nxb4 -2.09/23 Ra5 -2.09/22

53.Ke3 -2.08/20 Be6 -1.88/21

54.Kd4? –+ -3.60/22

[Rybka 2.3.2a: 54.Nd5 Ng5 55.Kd3 Ra4 56.Ne3 Bf7 57.Kc3 Ne4+ 58.Kb3 Nc5+ 59.Ka2 Kh7 60.Rd1 Be6 –+ -1.88/21 ]

54...Ng5 -3.47/20

55.Nc2 -3.60/24 a2 -3.60/22

56.Nb4 -3.60/23 Ra4 -3.60/21

57.Kc5?–+ -5.73/16

[Rybka 2.3.2a: 57.Nd5 Kg7 58.Kc3 Ne4+ 59.Kb3 Nc5+ 60.Kc3 Bf5 61.h3 Kh6 62.Ne3 Ra3+ 63.Kb4 Rxe3 –+ -3.60/21 ]

57...Ne4+ -5.73/17

58.Kb5? –+ -8.53/18

[Rybka 2.3.2a: 58.Kd4 Rxb4 59.Rxa2 Bxc4 60.Ra3 Bf7+ 61.Ke5 Kg7 62.Rf3 Ng5 63.Rf2 Rb5+ 64.Kd4 Bd5 –+ -5.73/17 ]

58...Bd7+ -9.40/20

59.Nc6 -7.99/16 Nc3+ -8.70/18

60.Kc5 -7.49/11 Bxc6 -8.74/16

61.Kxc6? –+ -19.29/11

[Rybka 2.3.2a: 61.h4 Be8 62.Kd4 Ne2+ 63.Ke3 Nc1 64.Rxc1 a1Q 65.Rxa1 Rxa1 66.Kd4 Rc1 67.c5 Bf7 –+ -8.74/16 ]

61...Rxc4+ -19.29/11

62.Kd6 -#18/11 Rd4+ -#18/11

63.Ke5 -#16/9 Rd1 -#16/9 0–1

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