Bratko Kopec #2

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MikeB
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Bratko Kopec #2

Post by MikeB »

in it's day, Bratko Kopec #2 was somewhat controversial as many people were not sure that the pawn sacrifice d5! led to a won game

[d]3r1k2/4npp1/1ppr3p/p6P/P2PPPP1/1NR5/5K2/2R5 w

and quite a few programs back in 1996 were playing the move. in fact it was noted by Ed Schroder that Rebel Decade played the move from the 3rd ply..
https://groups.google.com/forum/#!topic ... zPq8eZdFhA

Now days most programs will play d5 and they play it pretty fast.

Fast forward 21 years, as I was revewing the games played in a set I am running, it caught my eye that McBrain (a stockfish engine) played a seemingly similar pawn sacrifice d5! ( it was not a sacrifice as McBrain was up a knight at the expense of two pawns at move 43)

tc 2:30 /2.5 sec ( same as CCRL 40/4 for my machine)
tcec 8 superfinal openings, McBrain is also using Cerebellum book here

Code: Select all

215 of 5600 games completed...
time control: 15000+250
Date: 02/08/17 : 00:39:49
215 game(s) loaded
Rank Name                      Rating   Δ     +    -     #     Σ    Σ%     W    L    D   W%    =%   OppR 
---------------------------------------------------------------------------------------------------------
   1 McBrain 2017 v1.2 64 POP   3216   0.0   47   47    55   38.5  70.0   24    2   29  43.6  52.7  3085 
   2 Komodo 10.3 64-bit         3201  14.9   49   49    53   35.0  66.0   23    6   24  43.4  45.3  3089 
   3 Stockfish 8 64 POPCNT      3190  10.6   48   48    55   35.5  64.5   23    7   25  41.8  45.5  3088 
   4 Komodo 9.42 64-bit         3085 104.9   48   48    55   26.0  47.3   14   17   24  25.5  43.6  3104 
   5 Stockfish 7 64 POPCNT      3081   4.3   48   48    54   25.0  46.3    9   13   32  16.7  59.3  3103 
   6 Stockfish 6 64 POPCNT      3044  37.0   48   48    55   22.0  40.0    8   19   28  14.5  50.9  3110 
   7 Hawkeye 1.03 OSx64         3014  29.5   52   52    49   18.0  36.7    7   20   22  14.3  44.9  3112 
   8 Komodo 8 64-bit            2969  44.9   50   50    54   15.0  27.8    3   27   24   5.6  44.4  3119 
---------------------------------------------------------------------------------------------------------
[pgn][Event "Computer chess game"]
[Site "Mac-Pro"]
[Date "Tue Feb 7 22:40:56 2017"]
[Round "1"]
[White "McBrain 2017 v1.2 64 POP"]
[Black "Komodo 9.42 64-bit"]
[Result "1-0"]
[TimeControl "15000+250"]
[FEN "r1bq1rk1/pp1n1ppp/5n2/2pp4/1b1P4/2NBPN2/PP3PPP/R1BQ1RK1 w - - 0 1"]
[SetUp "1"]

1. Qb3 Bxc3 2. Qxc3 b6 3. b3 Ne4 4. Qc2 Bb7 5. Bb2 Rc8 6. Qe2 Re8 7. Rac1 Nd6 8. Ne5 Nf8 9. dxc5 bxc5 10. Qh5 f6 11. Nf3 Qb6 12. Rfd1 Rc7 13. Nd2 Rf7 14. Qh3 Bc8 15. Qg3 Ne6 16. Qh4 f5 17. Nf3 Bb7 18. Ne5 Rfe7 19. Qh5 Qa5 20. a3 Qb6 21. b4 cxb4 22. axb4 d4 23. Bxd4 Nxd4 24. exd4 Qxb4 25. Rb1 Qa5 26. Qh4 Bd5 27. Qf4 Qd8 28. Ra1 Rc7 29. Ra6 Be4 30. Bf1 Bd5 31. Rda1 Ne4 32. R6a5 Be6 33. Qe3 Ree7 34. g3 g6 35. d5 Bxd5 36. Qd4 Nc3 37. R5a3 Qd6 38. Rxc3 Rxc3 39. Nc4 Qe6 40. Qxc3 Qe4 41. f3 Qxf3 42. Qxf3 Bxf3 43. Ra5 Kg7 44. Kf2 Bc6 45. Be2 a6 46. Nd2 Ra7 47. Nf3 Be4 48. Nd4 Kf6 49. Ke3 Bg2 50. Rxa6+ Rxa6 51. Bxa6 Ke5 52. Bc4 g5 53. Ne6 h6 54. Nd8 Kf6 55. Nf7 Kg7 56. Bb3 Kg6 57. Nd6 Kf6 58. Bc4 Bc6 59. Bd3 Bd7 60. Kd4 f4 61. gxf4 gxf4 62. Ke4 Ke6 63. Nc4 f3 64. Kxf3 Kf6 65. Kf4 Be6 66. Nd6 Bf7 67. Bc4 Bg6 68. Bd5 Bb1 69. Be4 Ba2 70. Nf5 Kg6 71. Ke5 Bf7 72. h4 Bg8 73. Ng3+ Kg7 74. Nh5+ Kh8 75. Kf6 Bf7 76. Ng7 Bg8 77. Nf5 Bh7 78. Nd6 Bg8 79. Kg6 Bb3 80. Kxh6 Be6 81. Bd3 Bb3 82. Be2 Ba4 83. Bd3 Kg8 84. Bb5 Bc2 85. Be2 Kf8 86. Kg5 Kg7 87. Bh5 Bb3 88. Ne8+ Kh7 89. Bf3 Bf7 90. Nd6 Kg7 91. Bh5 Bb3 92. Bg6 Bd1 93. h5 Bxh5 94. Bxh5 Kh7 95. Kf6 Kh6 96. Be2 Kh7 97. Nf7 Kg8 98. Bd3 Kf8 99. Bh7 Ke8 100. Ne5 Kd8 101. Ke6 Kc7 102. Nd7 Kb7 103. Bd3 Kc6 104. Be2 Kc7 105. Bf3 Kd8 106. Kd6 Ke8 107. Bh5+ Kd8 108. Nc5 Kc8 109. Be2 Kd8 110. Bb5 Kc8 111. Bd7+
Kb8 112. Kc6 Ka7 113. Kc7 Ka8 114. Kb6 Kb8 115. Na6+ Ka8 116. Bc6#
{Black Checkmated} 1-0
[/pgn]

[d]3q2k1/p1r1r2p/4b1p1/R3Np2/3Pn3/4Q1P1/5P1P/R4BK1 w - - 0 35

It takes McBrain , in single thread mode , about about 90 seconds to find it on my machine from a clean start, but the score quickly goes to 230+ shortly there after.

The games ends in a "kbnk" ending which you don't see too often with programs..
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MikeB
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Location: Pen Argyl, Pennsylvania

Re: Bratko Kopec #2

Post by MikeB »

I will post periodic updates - once or twice a day as the set runs for those that might be interested:

Code: Select all

225 of 5600 games completed...
time control: 15000+250
Date: 02/08/17 : 00:50:59
225 game(s) loaded
Rank Name                      Rating   Δ     +    -     #     Σ    Σ%     W    L    D   W%    =%   OppR 
---------------------------------------------------------------------------------------------------------
   1 McBrain 2017 v1.2 64 POP   3218   0.0   47   47    56   39.5  70.5   25    2   29  44.6  51.8  3083 
   2 Stockfish 8 64 POPCNT      3190  28.1   48   48    57   37.0  64.9   24    7   26  42.1  45.6  3087 
   3 Komodo 10.3 64-bit         3187   2.4   48   48    56   36.0  64.3   23    7   26  41.1  46.4  3088 
   4 Stockfish 7 64 POPCNT      3090  97.0   47   47    56   27.0  48.2   11   13   32  19.6  57.1  3101 
   5 Komodo 9.42 64-bit         3089   1.5   48   48    56   27.0  48.2   15   17   24  26.8  42.9  3102 
   6 Stockfish 6 64 POPCNT      3051  37.8   47   47    57   23.5  41.2    9   19   29  15.8  50.9  3108 
   7 Hawkeye 1.03 OSx64         3002  48.9   49   49    56   19.0  33.9    7   25   24  12.5  42.9  3114 
   8 Komodo 8 64-bit            2973  29.2   49   49    56   16.0  28.6    3   27   26   5.4  46.4  3118 
---------------------------------------------------------------------------------------------------------
For those that might not know, Hawkeye is a Gull engine.
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MikeB
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Location: Pen Argyl, Pennsylvania

Re: Bratko Kopec #2

Post by MikeB »

The AM update:

Code: Select all

560 of 5600 games completed...
time control: 15000+250
Date: 02/08/17 : 06:19:58
561 game(s) loaded
Rank Name                      Rating   Δ     +    -     #     Σ    Σ%     W    L    D   W%    =%   OppR 
---------------------------------------------------------------------------------------------------------
   1 McBrain 2017 v1.2 64 POP   3233   0.0   30   30   140  101.5  72.5   66    3   71  47.1  50.7  3081 
   2 Stockfish 8 64 POPCNT      3197  36.2   30   30   141   93.0  66.0   58   13   70  41.1  49.6  3086 
   3 Komodo 10.3 64-bit         3172  25.6   30   30   141   87.0  61.7   51   18   72  36.2  51.1  3089 
   4 Komodo 9.42 64-bit         3102  69.1   30   30   140   70.5  50.4   37   36   67  26.4  47.9  3100 
   5 Stockfish 7 64 POPCNT      3100   2.9   29   29   140   69.5  49.6   28   29   83  20.0  59.3  3101 
   6 Stockfish 6 64 POPCNT      3036  64.0   29   29   142   54.5  38.4   18   51   73  12.7  51.4  3111 
   7 Komodo 8 64-bit            3015  20.9   30   30   140   50.0  35.7   17   57   66  12.1  47.1  3112 
   8 Hawkeye 1.03 OSx64         2946  68.6   31   31   138   35.0  25.4    9   77   52   6.5  37.7  3123 
---------------------------------------------------------------------------------------------------------
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MikeB
Posts: 4889
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Location: Pen Argyl, Pennsylvania

Re: Bratko Kopec #2

Post by MikeB »

The PM update:

Code: Select all

1384 of 5600 games completed...
time control: 15000+250
Date: 02/08/17 : 20:01:43
1384 game(s) loaded
Rank Name                      Rating   Δ     +    -     #     Σ    Σ%     W    L    D   W%    =%   OppR 
---------------------------------------------------------------------------------------------------------
   1 McBrain 2017 v1.2 64 POP   3218   0.0   18   18   348  244.0  70.1  150   10  188  43.1  54.0  3083 
   2 Stockfish 8 64 POPCNT      3192  25.5   18   18   347  227.0  65.4  131   24  192  37.8  55.3  3087 
   3 Komodo 10.3 64-bit         3147  45.3   18   18   343  199.0  58.0  104   49  190  30.3  55.4  3093 
   4 Komodo 9.42 64-bit         3113  34.2   18   18   345  179.5  52.0   88   74  183  25.5  53.0  3099 
   5 Stockfish 7 64 POPCNT      3108   4.7   17   17   348  178.0  51.1   69   61  218  19.8  62.6  3099 
   6 Stockfish 6 64 POPCNT      3044  64.2   17   17   347  138.5  39.9   41  111  195  11.8  56.2  3108 
   7 Komodo 8 64-bit            3023  20.3   18   18   347  128.5  37.0   43  133  171  12.4  49.3  3111 
   8 Hawkeye 1.03 OSx64         2956  68.0   18   18   343   89.5  26.1   18  182  143   5.2  41.7  3121 
---------------------------------------------------------------------------------------------------------
The cerebellum book is doing quite well, a loss percentage less than 3% against these engines is quite an accomplishment.
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MikeB
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Re: Bratko Kopec #2

Post by MikeB »

The AM update:

Code: Select all

2101 of 5600 games completed...
time control: 15000+250
Date: 02/09/17 : 08:14:03
2101 game(s) loaded
Rank Name                      Rating   Δ     +    -     #     Σ    Σ%     W    L    D   W%    =%   OppR 
---------------------------------------------------------------------------------------------------------
   1 McBrain 2017 v1.2 64 POP   3216   0.0   14   14   528  369.5  70.0  227   16  285  43.0  54.0  3083 
   2 Stockfish 8 64 POPCNT      3185  31.2   14   14   527  340.0  64.5  184   31  312  34.9  59.2  3088 
   3 Komodo 10.3 64-bit         3149  35.9   14   14   522  304.0  58.2  160   74  288  30.7  55.2  3093 
   4 Komodo 9.42 64-bit         3114  35.1   14   14   522  273.0  52.3  130  106  286  24.9  54.8  3098 
   5 Stockfish 7 64 POPCNT      3108   6.1   14   14   528  270.0  51.1   96   84  348  18.2  65.9  3099 
   6 Stockfish 6 64 POPCNT      3042  66.0   14   14   528  209.0  39.6   60  170  298  11.4  56.4  3109 
   7 Komodo 8 64-bit            3023  18.3   14   14   524  194.0  37.0   64  200  260  12.2  49.6  3111 
   8 Hawkeye 1.03 OSx64         2964  59.9   14   14   523  141.5  27.1   30  270  223   5.7  42.6  3119 
---------------------------------------------------------------------------------------------------------
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MikeB
Posts: 4889
Joined: Thu Mar 09, 2006 6:34 am
Location: Pen Argyl, Pennsylvania

Re: Bratko Kopec #2

Post by MikeB »

Final Update
Opening Book: TCEC 8 Super Finals ( 50 positions)
McBrain had the Cerebellum book by Thomas Zipproth enabled.
Hash 64 MB
6 Man Syzygy Tablebases enabled for all engines
TC: 2:30 /2.5 sec ( Equivalent to CCRL 40/4 on my machine )

Code: Select all

100 rounds and 2800 games completed...
time control: 15000+250
Date: 02/09/17 : 20:15:01
2800 game(s) loaded
Rank Name                      Rating   Δ     +    -     #     Σ    Σ%     W    L    D   W%    =%   OppR 
---------------------------------------------------------------------------------------------------------
   1 McBrain 2017 v1.2 64 POP   3214   0.0   12   12   700  487.5  69.6  297   22  381  42.4  54.4  3084 
   2 Stockfish 8 64 POPCNT      3182  31.4   12   12   700  449.0  64.1  243   45  412  34.7  58.9  3088 
   3 Komodo 10.3 64-bit         3149  33.0   12   12   700  408.5  58.4  213   96  391  30.4  55.9  3093 
   4 Komodo 9.42 64-bit         3114  35.1   12   12   700  367.0  52.4  176  142  382  25.1  54.6  3098 
   5 Stockfish 7 64 POPCNT      3106   8.6   12   12   700  356.0  50.9  127  115  458  18.1  65.4  3099 
   6 Stockfish 6 64 POPCNT      3044  61.7   12   12   700  280.5  40.1   80  219  401  11.4  57.3  3108 
   7 Komodo 8 64-bit            3022  21.4   12   12   700  257.5  36.8   79  264  357  11.3  51.0  3111 
   8 Hawkeye 1.03 OSx64         2968  54.3   12   12   700  194.0  27.7   40  352  308   5.7  44.0  3119 
---------------------------------------------------------------------------------------------------------
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