CT800 V1.11 release + Winboard-version

[Ras]

I have released V1.11 of the CT800, and there is a PC version included, using the Winboard protocol. Thanks again to George Georgopoulos whose xboard code from NG-Play I could large reuse, only that the internal interfaces have changed a lot.

Enhancements are that the "ping" command is implemented, the "new" command works as intended -- so in Arena, it is not necessary to restart the engine before a new game, though I'd still recommend to do so because Arena can be bit quirky at times. Time per move ("st") and search ply limitation ("sd") are included, independently from each other, the engine announces its name to the GUI ("myname"), and there are logo PNGs.

For Windows, pre-built executables are available, both in 32 and 64 bit (tested with Arena 3.5.1 and Winboard 4.8.0). Linux users can go with the build shell scripts. I'm a bit lost on Mac users since I have no idea how to generate a Mac binary. Should be easy enough for someone with GCC installed, the relevant build options are in the build files.

There are minor differences between the PC and the ARM version; the PC version is using 235 MB for the hash tables, and the "easy move" verification depth is 6 plies instead of 4 plies. The advanced time management of the CT800 is only partially implemented on the PC, and the analysis and mate solving modes are not available.

Since the ARM device is designed to play humans, there is a certain Elo impact. The opening book favours variety over strength, and the idea of keeping the board full for confusing players does not really work against other computers. Still, I'd expect something like 2200 Elo on CCRL.

As for additional features in V1.11, the hash tables are not completely cleared before a move (only 25%). Some additional dubious openings are included as passive knowledge (Shirov, Elephant and Budapest Gambit) since these can happen on club level. The opening book can be changed, but this requires a re-compile because the include mechanism is the same as on the ARM platform which does not even have a file system.

The funny thing is that the engine started out on the PC, went on ARM Cortex-M4, and now back to the PC. There and back again - a chess engine's tale.

Info and download: https://www.ct800.net/sw_release_v111.htm
Direct download link: https://www.ct800.net/download/ct800-v1.11.zip

P.S.: if you want to have an idea how the ARM device is playing, just reduce the timing. On AMD Phenom-2 1100T, one second on the PC is about 50 seconds on ARM.

[mclane]

Is there a benchmark or switch so we can set it up 1:1 to the available hardware you build?

[Ras]

A switch wouldn't make sense because the time management is different anyway, but here is an easy benchmark. The game starts with 1. a2-a3 a7-a6 to get out of the book. On ARM, the analysis mode tells the time for each depth level. On the PC, start the engine directly, i.e. without GUI, and use the following xboard command sequence:

Code: Select all

new
force
post
st 10
a2a3
a7a6
go

The first number in each line is the depth in plies, the third is the time in centiseconds. The PC version suppresses output during the first 150 ms of the calculation, so you might not see the depth level 7 output if your PC is much faster (per core) than mine.

Here the results for my trusty old AMD Phenom-2 1100T:

Code: Select all

D  T:ARM  T:PC   Factor
7  8s     0.18s  44
8  24s    0.56s  43
9  59s    1.10s  54
10 178s   2.80s  65

[Norbert Raimund Leisner]

10 games (totally 30 min) vs. ChessGenius Classic 7.2 Engine 16-bit
(without the features permanent brain and opening book)
ChessGenius Classic 7.2 = games 1,3,5,7,9
CT 800 1.11 win32 = games 2,4,6,8,10

[White "ChessGenius Classic 7.2"]
[Black "Ct800_v1.11_x32"]
[Result "1-0"]
[Opening "Aljechin-Verteidigung"]
[ECO "B02"]
[Variation "2.e5 Nd5"]
[Termination "normal"]
[PlyCount "97"]


1. e4 Nf6 2. e5 Nd5 3. Nf3 d6 4. Bc4 e6 5. O-O dxe5 6. Nxe5 Bd6 7. d4 O-O 8. Nd2 c6 9. Ne4 Bxe5 10. dxe5 Nd7 11. f4 b5 12. Bd3 Qb6+ 13. Kh1 Bb7 14. a4 a6 15. Qh5 h6 16. f5 Qc7 17. Bxh6 Qxe5 18. Qg4 Rad8 19. Nc5 Qf6 20. Bg5 Nxc5 21. Bxf6 Nxf6 22. Qg3 Rfe8 23. fxe6 Rxe6 24. Bf5 Red6 25. Qe3 Rd5 26. axb5 axb5 27. b4 Na4 28. Qe7 Ba8 29. Rfe1 Rf8 30. Re5 Nb6 31. h3 Rdd8 32. Ree1 Nbd5 33. Qc5 Rfe8 34. Rxe8+ Rxe8 35. Ra7 g6 36. Bd3 Kg7 37. Qd6 Kg8 38. Kh2 Kg7 39. Qg3 Ne7 40. Qc7 Nfd5
41. Qa5 Rb8 42. Rxa8 Rxa8 43. Qxa8 Nxb4 44. Qd8 Ned5 45. Bxb5 cxb5 46. c3 Nc6 47. Qxd5 Ne7 48. Qxb5 f5 49. c4 1-0

[White "Ct800_v1.11_x32"]
[Black "ChessGenius Classic 7.2"]
[Result "1-0"]
[Opening "Aljechin-Verteidigung"]
[ECO "B02"]
[Variation "Sämisch-Angriff, 3...Nxc3"]
[Termination "normal"]
[PlyCount "105"]

1. e4 Nf6 2. e5 Nd5 3. Nc3 Nxc3 4. bxc3 Nc6 5. Nf3 d6 6. d4 dxe5 7. d5 Nb8 8. Nxe5 c6 9. Bc4 Qd6 10. Bf4 Nd7 11. Qd4 Nxe5 12. Bxe5 c5 13. Qe3 Qg6 14. O-O Bd7 15. Qxc5 f6 16. Bc7 b6 17. Qd4 Bh3 18. Bg3 Bd7 19. Rfe1 Qf5 20. Bd3 Qg4 21. Re4 Qg5 22. d6 e6 23. Qc4 Qc5 24. Rxe6+ Kd8 25. Qxc5 bxc5 26. Ree1 Rc8 27. Rab1 c4 28. Be4 h5 29. h4 a5 30. Bb7 Rb8 31. Ba6 Ra8 32. Bxc4 Rc8 33. Ba6 Ra8 34. Rb6 g5 35. c4 Bg7 36. c5 Re8 37. Reb1 Ba4 38. c6 Bxc6 39. Rxc6 gxh4 40. Bxh4 Re6 41. Bc4 Re4 42. Rb7 Rxh4 43. Be6 Bf8 44. d7 Ke7 45. Rc8 Kxe6 46. d8=Q Rh1+ 47. Kxh1 Rxc8 48. Qxc8+ Ke5 49. Rb5+ Bc5 50. Qxc5+ Ke6 51. Qd5+ Ke7 52. Rb7+ Ke8 53. Qg8+ 1-0

[White "ChessGenius Classic 7.2"]
[Black "Ct800_v1.11_x32"]
[Result "1-0"]
[Opening "Französische Verteidigung"]
[ECO "C00"]
[Variation "2.Nf3"]
[Termination "normal"]
[PlyCount "181"]

1. e4 e6 2. Nf3 Be7 3. Bb5 Nf6 4. e5 Nd5 5. O-O O-O 6. Nc3 Nxc3 7. dxc3 d6 8. Bf4 dxe5 9. Nxe5 f6 10. Nf3 e5 11. Bc4+ Kh8 12. Qxd8 Bxd8 13. Be3 Be7 14. h3 Bf5 15. Rac1 Rd8 16. Nh4 Bd7 17. Rcd1 Nc6 18. Bd3 g6 19. Nf3 a5 20. Be4 a4 21. a3 Na5 22. Bd3 Be6 23. Nd2 Rd5 24. f4 Rad8 25. fxe5 fxe5 26. Rde1 Bg8 27. Nf3 Bf6 28. Ng5 Kg7 29. Rf3 Be7 30. Ref1 Rf8 31. Rxf8 Bxf8 32. Nf3 Nc6 33. Re1 Bd6 34. c4 Ra5 35. Re2 h6 36. Bd2 Ra8 37. Bc3 Kf6 38. Kf1 Re8 39. c5 Bxc5 40. Bb5 Rd8 41. Bxc6 Rd1+ 42. Be1 bxc6 43. Nxe5 Bd4 44. Nd7+ Kf5 45. c3 Bxc3 46. bxc3 Rxd7 47. g4+ Kf6 48. Re4 Bb3 49. Ke2 Bc2 50. Rd4 Rxd4 51. cxd4 h5 52. gxh5 gxh5 53. Kd2 Bb3 54. Bh4+ Ke6 55. Kc3 Kd5 56. Bg3 Bd1 57. Bxc7 Be2 58. Bd8 Bf1 59. h4 Bc4 60. Bf6 Ba2 61. Kb4 Bb3 62. Bh8 Bc2 63. Bg7 Bd1 64. Bf6 Kd6
65. Be5+ Ke6 66. Kc5 Bf3 67. Bc7 Bg2 68. Kb4 Kd5 69. Bb6 Be4 70. Kxa4 Kc4 71. Ka5 Bf5 72. Bc5 Bc2 73. Kb6 Kd5 74. Kc7 Ba4 75. Kd7 Bc2 76. Ke7 Bb3 77. Kf6 Ke4 78. Kg6 Bd1 79. Kg5 Bf3 80. a4 Bd1 81. a5 Be2 82. Kf6 Kf4 83. Ke6 Kg4 84. Be7 Kf4 85. Kd7 Bc4 86. Kc7 Ke3 87. Bc5 Kf3 88. Kb6 Kg4 89. Kxc6 Kf5 90. d5 Ke5 91. d6 1-0

[White "Ct800_v1.11_x32"]
[Black "ChessGenius Classic 7.2"]
[Result "1-0"]
[Opening "Englisch"]
[ECO "A29"]
[Variation "Vierspringer, 4.g3 Bc5 5.Bg2 d6 6.O-O O-O 7.d3"]
[Termination "normal"]
[PlyCount "105"]

1. c4 e5 2. Nc3 Nc6 3. g3 Bc5 4. Nf3 Nf6 5. Bg2 O-O 6. O-O d6 7. d3 Bb6 8. Bg5 h6 9. Bh4 g5 10. Nxg5 Qd7 11. Nge4 Nxe4 12. Nxe4 Qe6 13. Nf6+ Kg7 14. g4 e4 15. Bxe4 Ne7 16. d4 d5 17. cxd5 Qd6 18. Bg3 Qxf6 19. Be5 Qxe5 20. dxe5 Bxg4 21. Qd2 f5 22. Bg2 Rad8 23. e6 Rg8 24. Kh1 Kh7 25. e4 Bh5 26. Qd3 Bg6 27. Qc4 fxe4 28. Bxe4 Rg7 29. Rad1 Rf8 30. Bxg6+ Nxg6 31. f4 Ne7 32. f5 Ng8 33. a4 Nf6 34. a5 Be3 35. Rf3 Bg5 36. h4 Ne8 37. hxg5 Rxg5 38. f6 Rh5+ 39. Kg2 Rg5+ 40. Kf1 Rxf6 41. Rxf6 Nxf6 42. Qxc7+ Kh8 43. Qd8+ Ng8 44. e7 Rf5+ 45. Kg2 Rg5+ 46. Kf3 Rf5+ 47. Ke4 Rg5 48. e8=Q Rg4+ 49. Kf3 Rg7 50. Qf6 Kh7 51. Qxg7+ Kxg7 52. Rg1+ Kh7 53. Qxg8+ 1-0

[White "ChessGenius Classic 7.2"]
[Black "Ct800_v1.11_x32"]
[Result "1/2-1/2"]
[Opening "Skandinavische Verteidigung"]
[ECO "B01"]
[Variation "Schiller, Bronstein-Variante"]
[Termination "normal"]
[PlyCount "86"]

1. e4 d5 2. exd5 Qxd5 3. Nc3 Qd6 4. d4 a6 5. Nf3 Nf6 6. a3 Bg4 7. Be2 e6 8. Bg5 Nc6 9. Bxf6 gxf6 10. Ne4 Qf4 11. Qd3 O-O-O 12. c3 Bf5 13. Nfd2 e5 14. g3 Bxe4 15. Nxe4 Qh6 16. Qf3 exd4 17. O-O Be7 18. Qf5+ Kb8 19. Bh5 Ne5 20. cxd4 Rxd4 21. Rfe1 Rhd8 22. Re2 R8d5 23. Nc3 Rc5 24. Bf3 Ng4 25. Qc2 Qxh2+ 26. Kf1 Re5 27. Bg2 Qh5 28. Rae1 c6 29. Ne4 Bd8 30. Rd1 Bb6 31. Rxd4 Bxd4 32. Qd3 Rd5 33. Qb3 Rb5 34. Qd3 Rxb2 35. Rxb2 Bxb2 36. Qd8+ Ka7 37. Nd6 Ne3+ 38. fxe3 Qd1+ 39. Kf2 Qd2+ 40. Kf3 Qd5+ 41. Kf2 Qd2+ 42. Kf3 Qd5+ 43. Kf2 Qd2+ 1/2-1/2

[White "Ct800_v1.11_x32"]
[Black "ChessGenius Classic 7.2"]
[Result "0-1"]
[Opening "Damenbauernspiel"]
[ECO "D04"]
[Variation "Colle-System: 3...Bg4"]
[Termination "normal"]
[PlyCount "146"]


1. Nf3 Nf6 2. d4 d5 3. e3 Bg4 4. c4 e6 5. Qb3 Nc6 6. Qxb7 Nb4 7. Qb5+ Qd7 8. Qxd7+ Nxd7 9. Na3 Bxf3 10. gxf3 c5 11. cxd5 Nxd5 12. e4 Nb4 13. dxc5 Bxc5 14. Bb5 a6 15. Bxd7+ Kxd7 16. O-O Ke7 17. Nc4 Nc2 18. Rb1 Rac8 19. b3 Rhd8 20. Rb2 Na3 21. Bd2 Nxc4 22. bxc4 Rd3 23. Kg2 Ba3 24. Bb4+ Bxb4 25. Rxb4 Ra3 26. Rb7+ Kf6 27. Rd1 Rxc4 28. Rdd7 Ke5 29. Rxf7 Rxa2 30. Rb1 Rcc2 31. Rf1 a5 32. Rxg7 h6 33. Rg6 a4 34. Rxh6 a3 35. Rh5+ Kf4 36. Rh6 Ke5 37. Kg3 Rab2 38. h4 a2 39. Rh5+ Kd4 40. Ra5 Kc3 41. Kg2 Kb3 42. f4 Rc4 43. Re1 Ra4 44. Rb5+ Kc3 45. Rc5+ Kd3 46. Rcc1 Rxe4 47. Rg1 Rc2 48. Rcd1+ Rd2 49. Rdf1 Rxf4 50. Kg3 Rf7 51. Rh1 Ke4 52. Re1+ Kd5 53. Rhf1 e5 54. f3 Ra7 55. Ra1 Rg7+ 56. Kh3 Kc4
57. Rac1+ Kb3 58. Rce1 Ra7 59. Ra1 Kb2 60. Rh1 Rd8 61. Kg3 Ra3 62. Kg4 Rg8+ 63. Kf5 Rf8+ 64. Ke4 Ra5 65. h5 Rf4+ 66. Ke3 Ra3+ 67. Ke2 Rfxf3 68. h6 Rfc3 69. h7 Rc2+ 70. Kd1 Rd3+ 71. Ke1 Kxa1 72. h8=Q Rb3
73. Kd1 Kb1 0-1

[White "ChessGenius Classic 7.2"]
[Black "Ct800_v1.11_x32"]
[Result "0-1"]
[Opening "Caro-Kann"]
[ECO "B10"]
[Variation "2.Nf3"]
[Termination "normal"]
[PlyCount "148"]

1. e4 c6 2. Nf3 d5 3. exd5 cxd5 4. Bb5+ Bd7 5. Bxd7+ Nxd7 6. d4 e6 7. Bf4 Qb6 8. Qc1 Qa6 9. Nbd2 Ngf6 10. Nf1 Be7 11. Ng3 O-O 12. c3 Rfc8 13. Qc2 h6 14. Qb3 Rc6 15. a3 Rb6 16. Qc2 Rc8 17. Rd1 Kh8 18. Rd2 Bxa3 19. bxa3 Qxa3 20. O-O Rxc3 21. Qd1 a6 22. Qe2 Rbc6 23. Ra2 Qf8 24. Rb1 b5 25. Ne5 Nxe5 26. dxe5 Nd7 27. Rba1 R3c4 28. Be3 Qc8 29. f4 b4 30. Rb2 Qc7 31. Qd1 a5 32. Ne2 Ra6 33. Nd4 a4 34. Nb5 Qb8 35. Nd6 Rxd6 36. exd6 b3 37. Qd2 Qxd6 38. Qa5 d4 39. Qa8+ Kh7 40. Qe4+ f5
41. Qd3 Qa6 42. Qd2 dxe3 43. Qxd7 Qb6 44. Qd3 Rd4 45. Qxe3 Rd1+ 46. Kf2 Qxe3+ 47. Kxe3 Rxa1 48. Kd4 Rc1 49. g3 Rc2 50. Rb1 Rxh2 51. Kc3 Kg6 52. Re1 Kh5 53. Ra1 Rc2+ 54. Kd3 Ra2 55. Rh1+ Kg4 56. Rh4+ Kxg3
57. Rh1 Kxf4 58. Rf1+ Ke5 59. Re1+ Kf6 60. Kc3 f4 61. Rf1 e5 62. Rd1 f3 63. Rf1 f2 64. Kc4 Ke6 65. Rb1 b2 66. Kc3 a3 67. Rf1 Ra1 68. Rxf2 b1=Q 69. Re2 Qd1 70. Rd2 Qe1 71. Kd3 Rb1 72. Rb2 Rxb2 73. Kc4 Qd1 74. Kc3 Qc2+ 0-1

[White "Ct800_v1.11_x32"]
[Black "ChessGenius Classic 7.2"]
[Result "0-1"]
[Opening "Nimzowitsch Verteidigung"]
[ECO "B00"]
[Variation "Bogoljubow, 3...dxe4"]
[Termination "normal"]
[PlyCount "138"]

1. e4 Nc6 2. d4 d5 3. Nc3 dxe4 4. d5 Ne5 5. Qd4 Ng6 6. Qxe4 Nf6 7. Qd3 a6 8. Bg5 h6 9. Bxf6 exf6 10. O-O-O Be7 11. Qe3 O-O 12. Bd3 Bd6 13. Bxg6 fxg6 14. Nf3 Re8 15. Qd4 b5 16. Rhe1 Rxe1 17. Rxe1 b4 18. Ne4 a5 19. Kb1 a4 20. Nh4 b3 21. Nxg6 Bf5 22. Nh4 bxc2+ 23. Kxc2 Bh7 24. Nf3 a3 25. b3 Ra5 26. Kc3 Bf8 27. d6 cxd6 28. Kd2 Bg6 29. b4 Ra8 30. Nc3 Rc8 31. Nh4 Bf7 32. Nd5 Qd7 33. Re3 Qb5 34. Rc3 Rb8 35. Rd3 Bxd5 36. Qxd5+ Qxd5 37. Rxd5 Rxb4 38. Ng6 Rb2+ 39. Ke3 Rxa2 40. Ra5 Kf7
41. Nh8+ Ke6 42. Ng6 Be7 43. Nf4+ Kf7 44. Ra7 Ra1 45. Ke2 a2 46. g3 g5 47. Nd5 Ke6 48. Nxe7 Rh1 49. Rxa2 Kxe7 50. Kd3 Rxh2 51. Kd4 Rh1 52. Re2+ Kf7 53. Rd2 h5 54. Kd5 Rf1 55. Kxd6 h4 56. gxh4 gxh4 57. Rd3 Rxf2 58. Rh3 Rf4 59. Kc6 f5 60. Kd6 Kf6 61. Kd5 Kg5 62. Rb3 Kg4 63. Rb8 h3 64. Ke5 Kg3 65. Rb3+ Rf3 66. Rb7 h2 67. Rg7+ Kf2 68. Rh7 Kg2 69. Rxh2+ Kxh2 0-1

[White "ChessGenius Classic 7.2"]
[Black "Ct800_v1.11_x32"]
[Result "1/2-1/2"]
[Opening "Philidor-Verteidigung"]
[ECO "C41"]
[Variation "Hanham-Aufbau"]
[Termination "normal"]
[PlyCount "248"]

1. e4 e5 2. Nf3 d6 3. d4 Nf6 4. Nc3 Nbd7 5. Bg5 Be7 6. dxe5 dxe5 7. Bc4 c6 8. O-O b5 9. Bb3 O-O 10. Bxf6 Bxf6 11. Qd6 Qb6 12. Rad1 Rd8 13. Qd3 Ba6 14. Nb1 h6 15. Rfe1 Nf8 16. Qe2 b4 17. Bc4 Bb7 18. c3 a5 19. cxb4 axb4 20. Rxd8 Rxd8 21. Qc2 c5 22. Qb3 Qc7 23. a3 bxa3 24. bxa3 Nh7
25. Nc3 Ng5 26. Nd5 Bxd5 27. Bxd5 Rb8 28. Qc3 Nxf3+ 29. Qxf3 c4 30. Qc3 Rb3 31. Qxc4 Qxc4 32. Bxc4 Rxa3 33. Rb1 g6 34. g3 Ra4 35. Bd5 Ra7 36. Rb5 Kg7 37. Bb3 g5 38. g4 Kg6 39. Kg2 Rc7 40. h3 h5 41. gxh5+ Kxh5 42. Kg3 Bg7 43. Rb6 f6 44. Ba4 Rc3+ 45. f3 Kg6 46. Be8+ Kh6 47. Bd7 Rc7 48. Bf5 Rc1 49. Rb7 Rh1 50. Kg2 Rd1 51. Rc7 Rb1 52. Ra7 Rc1 53. Kg3 Rf1 54. Rc7 Rg1+ 55. Kf2 Ra1 56. Rb7 Ra2+ 57. Kg3 Ra3 58. Rc7 Rd3 59. Ra7 Rb3 60. Rd7 Rc3 61. Rf7 Re3 62. Re7 Rc3 63. Rd7 Rb3 64. Ra7 Rd3 65. Rc7 Ra3 66. Rb7 Rd3 67. Bg4 Rd1 68. h4 gxh4+ 69. Kxh4 Rg1 70. Bf5 Ra1 71. Kg3 Bf8 72. Rf7 Bg7 73. f4 Kh5 74. fxe5 fxe5 75. Kf3 Ra3+ 76. Ke2 Bh6 77. Rf6 Rg3 78. Kf2 Bf4 79. Rf7 Re3 80. Rg7 Rd3 81. Rg6 Kh4 82. Rg4+ Kh5 83. Rg7 Rd2+ 84. Ke1 Rb2 85. Rg6 Be3 86. Rg8 Kh4 87. Be6 Bg5 88. Rg7 Rc2 89. Bf5 Ra2 90. Kf1 Rb2 91. Be6 Kh5 92. Rg8 Rd2 93. Bf5 Be3 94. Bg4+ Kh4 95. Be6 Bg5 96. Bf5 Rb2 97. Rg7 Ra2 98. Be6 Rc2 99. Bd7 Kh5 100. Bh3 Kh6 101. Rg8 Ra2 102. Be6 Rd2 103. Bf5 Rb2 104. Bd7 Be3 105. Bc6 Rf2+ 106. Ke1 Rc2 107. Bd5 Kh7 108. Bb3 Rb2 109. Be6 Rh2 110. Rg4 Bd4 111. Bf5+ Kh6 112. Rg6+ Kh5
113. Rg8 Rb2 114. Be6 Kh4 115. Kd1 Bc5 116. Rg7 Be3 117. Rg4+ Kh5 118. Rg8 Bg5 119. Bf5 Rd2+ 120. Ke1 Rc2 121. Rh8+ Bh6 122. Rd8 Kg5 123. Kd1 Rc6 124. Ke2 Rc2+ 1/2-1/2


[White "Ct800_v1.11_x32"]
[Black "ChessGenius Classic 7.2"]
[Result "0-1"]
[Opening "Spanische Partie"]
[ECO "C78"]
[Variation "5.O-O b5 6.Bb3 Be7"]
[Termination "normal"]
[PlyCount "64"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O b5 6. Bb3 Be7 7. d4 d6 8. dxe5 Nxe5 9. Nc3 Bg4 10. Nxe5 Bxd1 11. Nxf7 Qd7 12. Nxh8 Bg4 13. Be3 Be6 14. Rfd1 Bxb3 15. axb3 Qe6 16. Nxb5 Kd7 17. f3 Qg8 18. Na7 Qxh8 19. Rxa6 Ne8 20. Ra2 g5 21. Bf2 Bf6 22. c3 Qg8 23. Ra3 Rb8 24. b4 Qc4
25. h3 Qe2 26. Rb1 h5 27. Ra5 g4 28. hxg4 hxg4 29. fxg4 Be5 30. Be1 Nf6 31. Rxe5 dxe5 32. Bh4 Nxe4 0-1

Norbert









[

[Dann Corbit]

The PC version is exciting for me,
Thank you for that

[Ras]

I'll have to look into game 3 because just throwing away the A pawn looks buggy, even in a drawn endgame with opposite bishops.

Game 7 is what I like most - a somewhat unsound piece sacrifice, delaying the opponent's castling and getting a pawn storm going.

Otherwise, I know that Scandinavian or Philidor aren't strongest with Black, but the opening book is using anything that is somewhat playable on club level.

[Ras]

In case you are a player somewhere on club level, I'd be interested in whether you enjoy human vs. machine games. About 2 or 3 seconds per move on the PC should give the equivalent of tournament performance on the target. The weird opening book will give you plenty of crazy positions.