Smooth scaling stockfish

[Dann Corbit]

I had sent the source to the author and to Jim, and then I made the source generally available.

I am pretty sure it will be easy to improve it. I am also fairly certain that using fractional plies will give a solid benefit compared to integral plies.

[JManion]

I played a 2 + 2 match on my windows 64 quad.

Stockfish 1.6s 64 bit (Dan) +28 -10 =70 58.33% 63/108
vs

Stockfish 1.6 JA 64 bit

[George Tsavdaris]

Am I doing something wrong here?

Using http://cap.connx.com/chess-engines/new- ... sh.exe.bz2

1 min + 1 sec time control
After 44 games:

20.5 Stockfish 1.6 64-bit JA 2CPU (the "official" version of Stockfish)
23.5 Stockfish above 64-bit 2CPU

The new one scored 54.44%, that is what, 20 elo?

No +31 ELO.

But i've run the 32bit versions and also with 1 CPU while you the 64bit and with 2 CPUs.

After 12 games in the Silver50 suite i get original S1.6 to lead with +1 point. That contradicts in a way my previous results, but we will see in the future for sure.

[Edward German]

A request: It would be very nice if I would see this engine 1.6s (by Dann Corbit) for download here:

http://homepages.tesco.net/henry.ablett/jims.html

Thanks in advance!

The Engine (I played only with the 32-Bit Version, compiled by Dann Corbit - and 1.6s played very well on my only "Core Duo 2.66 GHz", against Rybka 3!!

Here few nice games from Playchess with my Account "Solist":

[Event "Wertungspartie, 1m + 0s"]
[Site "Maschinenraum"]
[Date "2009.12.29"]
[Round "?"]
[White "Forevergm"]
[Black "Solist, Stockfish 1.6s"]
[Result "0-1"]
[ECO "B17"]
[WhiteElo "2498"]
[Annotator "0.36;0.20"]
[PlyCount "184"]
[EventDate "2009.11.20"]
[TimeControl "60"]

{Rybka 3 32-bit: 15.1 ply; 172kN/s Intel(R) Core(TM) i5 CPU 750 @ 2.
67GHz 2664MHz, (4 threads), onnoII.ctg, 128 MB} 1. e4 {B/0 0} c6 {B/0 0} 2. d4
{B/0 0} d5 {B/0 0} 3. Nc3 {B/0 0} dxe4 {B/0 0} 4. Nxe4 {B/0 0} Nd7 {B/0 0} 5.
Bc4 {B/0 0} Ngf6 {B/0 0} 6. Ng5 {B/0 0} e6 {B/0 0} 7. Qe2 {B/0 0} Nb6 {B/0 0}
8. Bd3 {B/0 0} h6 {B/0 0} 9. N5f3 {B/0 0} c5 {B/0 0} 10. dxc5 {B/0 0} Bxc5 {
B/0 0} 11. Ne5 {B/0 0} Nbd7 {B/0 0} 12. Ngf3 {B/0 0} Qc7 {B/0 0} 13. O-O {B/0 0
} O-O {B/0 0} 14. Re1 {B/0 0} Nxe5 {0.20/12 2} 15. Nxe5 {B/0 0} Bd6 {0.44/14 2}
16. Bf4 {0.36/10 1} b6 {B/0 0} 17. Qf3 {B/0 0} Bb7 {0.12/16 5} 18. Qh3 {B/0 0}
Rad8 {0.00/15 1} 19. a3 {0.00/10 1} Nd7 {0.00/15 3} 20. Bxh6 {0.00/12 0} Nxe5 {
0.00/15 1} 21. Bxg7 {-0.13/12 2} f5 {-0.04/14 0} 22. Qh8+ {0.00/12 5} Kf7 {
0.00/17 0} 23. Qh7 {0.00/12 1} Nf3+ {0.00/15 0} 24. Kh1 {0.00/13 2} Ng5 {
(Nxe1) 0.00/15 0} 25. Qh5+ {0.14/8 1} Kxg7 {0.00/14 0} 26. Qxg5+ {0.23/9 0} Kf7
{0.00/15 1} 27. Qh5+ {0.15/9 0} Ke7 {0.00/13 1} 28. Bxf5 {0.27/10 1} Bc8 {
(Bd5) 0.00/13 1} 29. Qh4+ {0.10/8 1} Rf6 {0.00/15 0} 30. Re3 {0.03/9 1} Bf4 {
(Kf7) 0.00/13 2} 31. Re4 {0.00/9 1} Be5 {0.00/13 2} 32. Rae1 {0.00/11 0} Rd4 {
-0.44/13 1} 33. c3 {0.00/11 0} Rxe4 {-0.40/14 2} 34. Bxe4 {0.00/14 0} Qc5 {
(Qd6) -0.40/13 1} 35. Bg6 {0.14/10 1} Bd7 {(Kd8) -0.64/13 2} 36. f3 {0.00/10 1}
Qb5 {(Qd6) -0.52/14 4} 37. Qh7+ {0.00/10 2} Kd8 {-0.60/13 1} 38. Rd1 {0.00/12 0
} Bd6 {-0.80/13 1} 39. Qh4 {0.00/13 1} Be7 {(Ke7) -0.84/15 0} 40. Qe4 {
-0.14/11 1} Qc5 {(Kc7) -0.68/14 2} 41. h3 {0.00/9 1} a5 {(Bd6) -0.64/14 1} 42.
Qd3 {0.27/10 1} Qd5 {(Qc7) -0.80/16 2} 43. Qe2 {0.14/11 1} Qc6 {
(Qc5) -0.40/15 1} 44. Be4 {0.23/12 1} Qc5 {(Qc7) -0.32/16 0} 45. Qd3 {0.22/10 1
} Qc7 {-0.28/15 0} 46. g3 {0.32/12 1} e5 {-0.40/14 1} 47. h4 {0.26/13 0} Rd6 {
-0.60/14 1} 48. Qe2 {0.15/14 0} Qc5 {-0.68/14 0} 49. Kg2 {0.09/13 2} a4 {
(Rxd1) -0.52/16 0} 50. Rd3 {0.18/10 1} Qc4 {(Rxd3) -0.56/14 1} 51. h5 {
0.16/11 1} Bg5 {-0.76/14 2} 52. Qd1 {0.02/12 0} Rxd3 {-0.88/15 1} 53. Bxd3 {
0.02/14 0} Qd5 {(Qe6) -1.01/15 0} 54. Qe2 {0.01/11 1} Ke7 {(Kc7) -1.05/16 0}
55. Qc2 {0.00/11 0} Be3 {(Qb3) -1.01/14 1} 56. Qe2 {0.00/11 0} Qc5 {
(Bg5) -1.01/13 1} 57. Qd1 {-0.03/10 1} Bh6 {-1.25/13 1} 58. Bc2 {-0.38/11 0}
Qb5 {-1.49/13 1} 59. b4 {-0.49/11 0} axb3 {-1.65/12 1} 60. Bxb3 {-0.42/13 0} e4
{(Bc6) -1.93/15 0} 61. fxe4 {-0.42/12 1} Be8 {-2.06/15 0} 62. g4 {-0.42/12 0}
Bd7 {(Qg5) -2.38/12 1} 63. e5 {-0.55/9 0} Qxe5 {(Bc6+) -2.58/14 0} 64. Qf3 {
-0.51/9 0} Be3 {-2.54/13 0} 65. Qf7+ {-0.61/11 0} Kd6 {-2.70/11 0} 66. Bd1 {
-0.67/11 0} Qxc3 {-2.82/13 0} 67. Bf3 {-0.71/12 0} Qd2+ {-2.90/14 0} 68. Kg3 {
-0.71/12 0} Kc7 {-2.98/14 0} 69. Qc4+ {-0.73/12 0} Bc5 {-2.70/14 0} 70. Kh3 {
-0.74/13 0} Qg5 {-3.03/15 0} 71. Kg3 {-1.14/12 0} Qe3 {(Qe5+) -2.78/12 1} 72.
Qe4 {-0.73/12 2} Qf2+ {-3.11/13 0} 73. Kf4 {-0.84/13 0} Qd2+ {-2.90/13 0} 74.
Kg3 {-0.94/13 2} Bd6+ {(Qd6+) -2.78/16 0} 75. Kh4 {-0.94/11 0} Kd8 {
(Qf2+) -2.74/15 0} 76. Qd5 {-0.67/9 0} Qh2+ {-2.74/15 0} 77. Kg5 {-0.89/12 0}
Qf4+ {-3.07/13 0} 78. Kh4 {-1.03/12 2} Qf6+ {-2.82/15 0} 79. Kh3 {-1.17/13 2}
Ke7 {-2.82/16 0} 80. Qe4+ {-1.16/13 1} Be6 {(Kf7) -3.15/15 0} 81. a4 {-0.79/9 0
} Qg5 {(Kf8) -3.15/13 0} 82. Qb7+ {-0.46/7 0} Kf8 {(Kf6) -3.35/12 0} 83. Qe4 {
-3.05/9 0} Qxh5+ {-6.50/12 1} 84. Kg2 {-3.46/13 0} Qh2+ {-6.46/14 0} 85. Kf1 {
-3.46/13 0} Bc5 {-6.58/15 0} 86. Bg2 {-3.46/12 1} Qg1+ {(Qh4) -6.58/15 0} 87.
Ke2 {-3.10/10 0} Bf7 {(Qf2+) -7.47/13 0} 88. Kd2 {-2.98/8 0} Qf2+ {-9.85/10 0}
89. Kd3 {-5.65/9 0} Qb2 {-10.30/13 0} 90. Qf5 {-6.69/8 1} Qxg2 {-10.34/8 0} 91.
Qf4 {-7.24/10 0} Qb2 {-17.53/11 0} 92. Qf5 {-6.89/7 0} Qd4+ {
Forevergm resigns -93.46/14 0} 0-1

[Event "Wertungspartie, 5m + 0s"]
[Site "Maschinenraum"]
[Date "2009.12.29"]
[Round "?"]
[White "Muszka, Rybka 3 Dynamic"]
[Black "Solist, Stockfish 1.6s"]
[Result "0-1"]
[ECO "B67"]
[WhiteElo "2603"]
[BlackElo "2476"]
[Annotator "0.53;0.00"]
[PlyCount "196"]
[EventDate "2009.11.21"]
[TimeControl "300"]

{Rybka 3 Dynamic: 20.2 ply; 227kN/s Intel(R) Core(TM)2 Quad CPU Q6600 @ 2.
40GHz 2400MHz, (4 threads), onnoII.ctg, 1024 MB} 1. e4 {B/0 0} c5 {B/0 0} 2.
Nf3 {B/0 0} Nc6 {B/0 0} 3. d4 {B/0 0} cxd4 {B/0 0} 4. Nxd4 {B/0 0} Nf6 {B/0 0}
5. Nc3 {B/0 0} d6 {B/0 0} 6. Bg5 {B/0 0} e6 {B/0 0} 7. Qd2 {B/0 0} a6 {B/0 0}
8. O-O-O {B/0 0} Bd7 {B/0 0} 9. f4 {B/0 0} h6 {B/0 0} 10. Bh4 {B/0 0} b5 {B/0 0
} 11. Bxf6 {B/0 0} gxf6 {B/0 0} 12. Kb1 {B/0 0} Qb6 {B/0 0} 13. Nce2 {B/0 0} h5
{B/0 0} 14. Qd3 {B/0 0} Ne7 {B/0 0} 15. g3 {B/0 0} Rd8 {B/0 0} 16. Nf3 {B/0 0}
f5 {B/0 0} 17. Ned4 {B/0 0} Bg7 {B/0 0} 18. Bh3 {B/0 0} fxe4 {B/0 0} 19. Qxe4 {
B/0 0} Bc6 {B/0 0} 20. Nxc6 {B/0 0} Qxc6 {B/0 0} 21. Qxc6+ {B/0 0} Nxc6 {B/0 0}
22. Rhe1 {B/0 0} Bf6 {B/0 0} 23. Nd2 {B/0 0} Ke7 {B/0 0} 24. Ne4 {B/0 0} h4 {
B/0 0} 25. g4 {0.53/14 4} Bd4 {B/0 0} 26. g5 {0.46/14 7} d5 {0.00/17 10} 27.
Nd2 {0.45/15 0} Bf2 {0.00/19 22} 28. Re2 {0.45/16 0} Bb6 {0.08/17 9} 29. Nf3 {
0.28/15 32} Bc7 {0.00/19 9} 30. f5 {0.28/15 0} e5 {0.00/19 9} 31. g6 {0.28/15 0
} f6 {-0.16/17 9} 32. Re3 {0.21/14 4} Bb6 {(Rd8-d6) -0.12/17 11} 33. Ra3 {
0.23/13 4} a5 {-0.32/17 7} 34. Rc3 {0.28/13 2} Rd6 {-0.44/18 9} 35. Nd2 {
-0.07/14 18} e4 {-0.28/17 18} 36. Bg4 {-0.07/15 0} b4 {(e4-e3) -0.44/17 6} 37.
Rh3 {0.00/13 2} Rdd8 {(Rd6-d7) -0.60/18 9} 38. Nf1 {-0.11/13 5} Kd6 {-0.88/17 3
} 39. c4 {-0.29/13 13} bxc3 {-0.72/19 0} 40. Rxc3 {-0.38/14 10} Rc8 {-0.80/17 0
} 41. Nd2 {-0.38/13 29} Nd4 {-1.41/17 14} 42. Rdc1 {-0.57/14 0} Rb8 {-1.37/16 7
} 43. Nb3 {-0.80/13 1} Ke5 {-1.61/17 5} 44. Nxd4 {-0.96/13 0} Bxd4 {-1.53/19 9}
45. Rb3 {-0.90/16 14} Rxb3 {-2.14/18 11} 46. axb3 {-0.91/17 0} Rb8 {-2.18/18 4}
47. Rc2 {-1.10/18 19} Bg1 {(Ke5-f4) -2.06/17 13} 48. h3 {-0.82/14 2} Kd6 {
-1.97/18 2} 49. Re2 {-0.81/15 0} Bb6 {(Bg1-c5) -1.81/19 4} 50. Kc1 {-0.70/16 3}
Bc5 {(Bb6-d4) -1.73/20 4} 51. Kd1 {-0.75/17 2} Bb4 {(Bc5-d4) -1.65/20 5} 52.
Rg2 {-0.70/17 2} Rg8 {-1.69/21 4} 53. Re2 {-0.70/19 0} Ke5 {-2.58/22 6} 54. Rc2
{-1.53/15 0} d4 {-3.95/21 2} 55. Rc6 {-2.57/15 2} d3 {-4.28/21 1} 56. Re6+ {
-2.71/16 2} Kf4 {-4.40/22 0} 57. Rxf6 {-2.71/18 2} e3 {-4.60/21 1} 58. Rc6 {
-2.71/18 1} e2+ {-4.76/23 2} 59. Bxe2 {-2.71/18 15} dxe2+ {-5.01/27 0} 60. Kxe2
{-3.33/20 13} Kxf5 {-5.09/28 0} 61. Rc4 {-3.33/19 13} Rxg6 {(Bb4-e7) -5.21/26 0
} 62. Rxh4 {-2.77/19 11} Rg2+ {-5.49/26 0} 63. Kd3 {-2.77/19 0} Rxb2 {
-5.49/25 3} 64. Kc4 {-2.87/21 1} Rf2 {-5.49/22 2} 65. Kb5 {-2.87/21 6} Rf3 {
-5.49/22 2} 66. Ka4 {-2.87/21 0} Be1 {(Bb4-c3) -5.49/23 3} 67. Rh5+ {-2.87/17 1
} Kg6 {-5.49/26 0} 68. Rd5 {-2.87/18 1} Rxh3 {-5.49/25 1} 69. Rd1 {-2.87/20 0}
Bc3 {-5.49/24 1} 70. Kb5 {-3.07/19 0} Kf5 {(Bc3-b4) -5.81/24 4} 71. Rc1 {
-3.30/17 7} Ke4 {(Kf5-f4) -6.22/21 3} 72. Rd1 {-3.62/16 1} Ke3 {-6.58/23 2} 73.
Ka4 {-3.64/17 0} Rh4+ {(Bc3-d2) -6.58/22 2} 74. Ka3 {-3.81/16 0} Bb4+ {
-6.70/22 1} 75. Ka4 {-4.05/18 0} Bd2+ {-6.74/21 2} 76. Ka3 {-4.65/19 4} Kd3 {
-8.28/24 5} 77. Rf1 {-4.65/21 0} Rf4 {(Kd3-c2) -10.74/20 1} 78. Rh1 {-4.65/16 6
} Bb4+ {(Kd3-c2) -14.62/23 0} 79. Ka4 {-5.05/14 1} Kc2 {-17.41/19 1} 80. Rh2+ {
-5.11/15 4} Bd2+ {-82.57/25 0} 81. Kb5 {-5.09/14 4} Rb4+ {-18.50/23 0} 82. Kxa5
{-5.18/15 3} Rh4+ {-83.03/22 2} 83. Rxd2+ {-5.17/14 0} Kxd2 {-#16/1 0} 84. Kb6
{-5.21/14 0} Rh5 {-#15/1 0} 85. Kc6 {-5.25/13 0} Kc3 {-#14/1 0} 86. Kd6 {
-5.33/13 1} Kxb3 {-#13/1 0} 87. Ke6 {-5.36/13 1} Kc4 {-#12/1 0} 88. Kd6 {
-5.36/12 0} Rd5+ {(Kc4-d4) -#11/1 0} 89. Ke7 {-5.36/11 0} Re5+ {-#10/1 0} 90.
Kd6 {-5.44/12 1} Re4 {(Kc4-d4) -#9/1 0} 91. Kc6 {-5.57/12 1} Rd4 {-#8/1 0} 92.
Kb6 {-#9/11 0} Rd6+ {(Kc4-d5) -#7/1 0} 93. Kb7 {-#8/10 0} Kb5 {(Kc4-c5) -#6/1 0
} 94. Kc7 {-#7/8 0} Rd2 {(Kb5-c5) -#5/1 0} 95. Kb7 {-#5/6 0} Rc2 {-#4/1 0} 96.
Ka7 {-#4/3 0} Kc6 {-#3/1 0} 97. Kb8 {-#3/3 0} Ra2 {(Kc6-b6) -#2/1 0} 98. Kc8 {
-#2/3 0} Ra8# {-#1/1 0} 0-1

[Event "Wertungspartie, 3m + 0s"]
[Site "Maschinenraum"]
[Date "2009.12.29"]
[Round "?"]
[White "Solist, Stockfish 1.6s"]
[Black "Vousatej, Rybka 3"]
[Result "1-0"]
[ECO "C10"]
[WhiteElo "2499"]
[BlackElo "2761"]
[Annotator "0.80;??"]
[PlyCount "153"]
[EventDate "2009.11.21"]
[TimeControl "180"]

{Rybka 3: 15.7 ply; 353kN/s Intel(R) Core(TM) i7 CPU 920 @ 2.67GHz,
(4 threads), onnoII.ctg, 1024 MB} 1. e4 {B/0 0} e6 {0} 2. d4 {B/0 0} d5 {0} 3.
Nd2 {B/0 0} dxe4 {0} 4. Nxe4 {B/0 0} Nd7 {0} 5. Nf3 {B/0 0} Be7 {0} 6. Bd3 {
B/0 0} Ngf6 {0} 7. Nxf6+ {B/0 0} Bxf6 {0} 8. Qe2 {B/0 0} c5 {0} 9. d5 {B/0 0}
Nb6 {0} 10. Bb5+ {B/0 0} Kf8 {0} 11. dxe6 {B/0 0} Bxe6 {0} 12. O-O {B/0 0} h6 {
0} 13. Rd1 {B/0 0} Qc7 {0} 14. a4 {B/0 0} Rd8 {0} 15. Rxd8+ {0.80/14 4} Qxd8 {0
} 16. Bf4 {0.84/17 13} Bxb2 {3} 17. Rd1 {0.60/18 8} Qc8 {0} 18. Be5 {0.72/17 6}
Bxe5 {4} 19. Qxe5 {0.36/17 3} f6 {5} 20. Qe4 {0.64/17 13} Kf7 {2} 21. a5 {
1.17/18 6} Nd7 {0} 22. c3 {0.56/14 10} Qc7 {
Solist,Stockfish 1.6s bietet Remis 3} 23. Re1 {0.52/14 9} Re8 {6} 24. Nh4 {
0.04/16 0} Kg8 {12} 25. Qa4 {0.44/18 0} Kf7 {6} 26. Qd1 {0.60/15 4} g6 {3} 27.
Qd3 {1.17/16 8} f5 {0} 28. g4 {1.45/15 3} a6 {17} 29. Ba4 {1.57/15 5} Kg7 {12}
30. gxf5 {1.85/15 7} gxf5 {0} 31. Rxe6 {2.30/15 5} Rxe6 {10} 32. Bxd7 {
2.26/18 0} Rf6 {13} 33. Nxf5+ {2.42/19 0} Kh8 {2} 34. Qd5 {2.38/16 0} Qf4 {3}
35. Kg2 {2.66/15 3} b5 {1} 36. axb6 {2.98/14 3} Rxb6 {5} 37. Qxc5 {3.07/17 0}
Rg6+ {1} 38. Ng3 {3.15/18 0} Qd6 {1} 39. Qxd6 {3.07/17 2} Rxd6 {0} 40. Ba4 {
2.94/18 2} Rd5 {2} 41. Ne4 {3.03/17 2} Ra5 {1} 42. Bc6 {2.94/17 3} Ra1 {1} 43.
c4 {2.94/17 0} a5 {1} 44. Nc5 {2.78/18 3} Kg7 {1} 45. Kf3 {2.94/16 1} Kf7 {1}
46. Bb5 {2.98/19 8} Kf6 {1} 47. Ke4 {3.27/16 2} Ra2 {1} 48. Ke3 {3.19/17 2} Ke7
{0} 49. Ne4 {3.27/18 2} Rb2 {1} 50. Kd4 {3.51/16 2} Ke6 {4} 51. h4 {3.63/20 1}
Rb1 {1} 52. Nc5+ {3.87/19 1} Kf5 {1} 53. Bd7+ {3.87/18 0} Kf6 {2} 54. f4 {
3.95/19 0} Ra1 {4} 55. Bb5 {3.79/20 0} Kf5 {1} 56. Nd3 {3.23/18 2} a4 {1} 57.
c5 {3.27/19 1} a3 {0} 58. Bc4 {3.23/18 1} a2 {0} 59. Bd5 {3.31/20 3} Kg4 {1}
60. c6 {2.34/16 2} Kxh4 {0} 61. Bc4 {2.98/15 4} Rc1 {0} 62. Bxa2 {3.23/15 0}
Rxc6 {2} 63. Bd5 {3.39/22 0} Rc7 {5} 64. Ke5 {5.17/24 0} Re7+ {2} 65. Be6 {
5.01/22 0} Ra7 {4} 66. Nf2 {5.37/27 0} Ra5+ {4} 67. Bd5 {7.12/24 0} h5 {2} 68.
f5 {7.22/24 0} Kg5 {3} 69. Ne4+ {7.27/23 0} Kh6 {1} 70. f6 {7.27/22 0} Kg6 {2}
71. Ke6 {7.27/23 0} Ra6+ {2} 72. Ke7 {7.27/23 0} Ra7+ {2} 73. Ke8 {7.32/23 0}
Ra5 {2} 74. f7 {7.32/22 0} Rb5 {0} 75. Nf6 {16.24/16 2} Rb8+ {1} 76. Ke7 {
15.95/9 0} Kf5 {0} 77. Ne8 {
Vousatej,Rybka 3 resigns (Lag: Av=0.27s, max=1.0s) 76.81/15 1} 1-0

[Event "Wertungspartie, 3m + 0s"]
[Site "Maschinenraum"]
[Date "2009.12.29"]
[Round "?"]
[White "Solist, Stockfish 1.6s"]
[Black "Chesswizz, Rybka 3"]
[Result "1/2-1/2"]
[ECO "B92"]
[WhiteElo "2468"]
[BlackElo "2599"]
[Annotator "1.77;0.00"]
[PlyCount "147"]
[EventDate "2009.11.21"]
[TimeControl "180"]

{Rybka 3: 14.5 ply; 88kN/s Intel(R) Core(TM)2 CPU 6300 @ 1.86GHz, (2
threads), onnoII.ctg, 128 MB} 1. e4 {B/0 0} c5 {B/0 0} 2. Nf3 {B/0 0} d6 {B/0 0
} 3. d4 {B/0 0} cxd4 {B/0 0} 4. Nxd4 {B/0 0} Nf6 {B/0 0} 5. Nc3 {B/0 0} a6 {
B/0 0} 6. Be2 {B/0 0} e5 {B/0 0} 7. Nb3 {B/0 0} Be7 {B/0 0} 8. O-O {B/0 0} O-O
{B/0 0} 9. Kh1 {B/0 0} Nc6 {B/0 0} 10. f3 {B/0 0} b5 {B/0 0} 11. Be3 {B/0 0}
Na5 {0.00/12 3} 12. Nxa5 {B/0 0} Qxa5 {0.04/12 2} 13. Qd2 {(Sd5) B/0 0} Qc7 {
-0.02/11 2} 14. Rfc1 {(Tac1) B/0 0} Qb7 {-0.03/12 7} 15. Nd5 {(Td1) B/0 0} Nxd5
{-0.08/13 5} 16. exd5 {B/0 0} Rb8 {-0.07/14 9} 17. b3 {B/0 0} Bf5 {-0.07/13 4}
18. c4 {B/0 0} Rfc8 {-0.12/13 4} 19. cxb5 {(c5) B/0 0} axb5 {0.00/13 3} 20. a4
{B/0 0} bxa4 {0.00/14 3} 21. bxa4 {B/0 0} Rxc1+ {0.00/14 2} 22. Rxc1 {B/0 0}
Qb2 {0.00/14 18} 23. g4 {(a5) B/0 0} Qxd2 {0.58/12 5} 24. Bxd2 {B/0 0} Rb2 {
0.47/14 3} 25. gxf5 {B/0 0} Rxd2 {1.10/15 16} 26. Rc8+ {B/0 0} Bf8 {1.06/17 4}
27. Bc4 {B/0 0} Rd1+ {1.11/17 13} 28. Kg2 {B/0 0} Ra1 {1.11/17 1} 29. Ra8 {
B/0 0} Rc1 {1.10/17 7} 30. Bd3 {B/0 0} Rd1 {1.11/17 5} 31. Be4 {B/0 0} f6 {
1.11/16 3} 32. a5 {B/0 0} g5 {1.10/16 2} 33. fxg6 {(a6) 1.77/19 8} hxg6 {
1.28/10 1} 34. Bxg6 {1.81/19 8} Rxd5 {1.46/14 0} 35. h4 {(Kg3) 2.22/19 10} Kg7
{1.27/10 1} 36. h5 {(Lf5) 2.30/18 7} Rd2+ {1.36/11 2} 37. Kg3 {2.54/19 9} d5 {
1.41/14 0} 38. a6 {2.66/17 5} Ra2 {1.41/13 2} 39. Ra7+ {2.34/18 2} Kh6 {
1.70/13 3} 40. Rf7 {2.18/19 0} Bc5 {1.70/13 0} 41. f4 {2.54/20 5} exf4+ {
1.71/15 0} 42. Kg4 {2.38/21 10} Rg2+ {1.51/15 0} 43. Kf5 {2.38/20 8} Rg5+ {
1.55/16 0} 44. Ke6 {2.58/20 8} Rg2 {1.55/14 0} 45. Rxf6 {(Kxf6) 2.58/17 6} Kg5
{1.73/10 1} 46. Rf5+ {2.66/17 0} Kh6 {1.75/13 0} 47. Rxf4 {(Le8) 2.62/19 2} Ra2
{1.40/11 1} 48. Bd3 {(Kxd5) 2.62/20 3} Kxh5 {1.33/11 0} 49. Kxd5 {2.54/19 2}
Kg5 {1.28/13 0} 50. Rf5+ {2.54/18 0} Kg4 {1.28/15 4} 51. Rf7 {2.50/21 0} Ra5 {
1.27/14 1} 52. Bc4 {2.50/21 2} Ba3+ {1.24/14 0} 53. Kd4 {(Ke4) 2.46/19 4} Kg5 {
1.24/13 1} 54. Ke4 {(Tb7) 2.46/20 2} Kg6 {1.23/13 1} 55. Rf3 {2.38/21 1} Bd6 {
1.23/13 1} 56. Rh3 {(Tb3) 2.30/18 2} Re5+ {1.08/11 1} 57. Kd4 {2.34/19 4} Ra5 {
1.06/15 0} 58. Rb3 {2.30/19 5} Kf5 {1.06/16 0} 59. Rf3+ {2.30/19 3} Kg6 {
1.04/16 0} 60. Rf1 {2.30/19 3} Bb8 {1.05/15 0} 61. Bd3+ {(Tb1) 2.30/19 2} Kg7 {
0.98/13 1} 62. Rf3 {2.30/18 0} Ba7+ {0.98/13 0} 63. Ke4 {2.26/19 5} Rc5 {
0.98/13 0} 64. Rf1 {(Th3) 2.22/18 3} Rc8 {0.98/13 1} 65. Kd5 {2.26/17 2} Rd8+ {
Solist,Stockfish 1.6s bietet Remis 0.98/16 0} 66. Ke6 {2.26/19 3} Rxd3 {
0.00/15 0} 67. Rf7+ {2.66/12 1} Kg8 {0.00/19 0} 68. Rxa7 {2.74/16 1} Rh3 {0}
69. Rb7 {0.00/1 0} Rh6+ {0} 70. Kd5 {0.00/1 0} Rxa6 {0} 71. Rc7 {0.00/1 0} Ra2
{0} 72. Kd4 {0.00/1 0} Re2 {0} 73. Kc3 {0.00/1 0} Kf8 {
Solist,Stockfish 1.6s bietet Remis 0} 74. Kd4 {
(Lag: Av=0.61s, max=1.9s) 0.00/1 0} 1/2-1/2

Very good played by Stockfish 1.6s (compiled version by Dann Corbit)!

My Best,
Eduard

[Nasir_Shaheen]

Is there a w32 compile? And I don't want to start a flame war, but if this is a modified SF, shouldn't the sources be made available as well?

I sent the sources to Tord and Jim Ablett. They may want to experiment a bit before it is released. The curve I used was just an eyeball crude approximation and so it probably could be made a lot better.

Here is my MS 64 bit compile (the other one is Jim's and I have actually been testing my build and so I do not know if they behave differently):
http://cap.connx.com/chess-engines/new- ... sh.exe.bz2

I will make a 32 bit compile also.

Hi Dan,
there is a difference in your 64bit compile and in that of Jim. Did you use the same sources for your compiles?
And which version should we use?

Dann's for sure.
I think he forgot to tell Jim about enabling some options to make the compile so Jim's compile is not how it was supposed to be.

In my computer i get in most positions +2 ply in the same time for Dann's S1.6 compared to normal S1.6 and with comparable evaluations(but not the same and this is that puzzles me).

Hi George,

Yes, I didn't know about the necessary macro.
Here's is my re-compiled Stockfish 1.6s x64 JA compile which
uses Dann's enhancements.

http://www.mediafire.com/?1njjnmee22k

Jim.

Where is the 32bit JA version with new changes ?

[George Tsavdaris]

After seeing 100 games from the pairs:
Dann's Stockfish 1.6 32 bit - Stockfish 1.6 32 bit (40 games)
Dann's Stockfish 1.6 32 bit - Rybka 3 32bit (30 games)
Stockfish 1.6 32 bit - Rybka 3 32bit (30 games)

Results clearly say that the modified Smooth Stockfish 1.6 32bit is stronger than the original unmodified. But there are the confidence intervals, the confidence levels, only 30 games, etc....

But by seeing the games one by one i can clearly say that the modified version is stronger! It just plays stronger, period. I can't say how much stronger of course and speak about concrete ELOs from my observations, i just see that it plays in the level of Rybka 3 and that it is stronger, i can even say a lot than the original.

Sometimes seeing a Chess game can tell you more from some raw numbers/results. Nonsense? Probably but i had that feeling now....


Perhaps it was the predefined positions that made this to be true and with another set of opening positions, the result and my opinion would be different, but i don't believe that.

Anyway here are the results(All with time control 4'+2" and for 32bit Stockfish and Rybka):

►Set-1(5 positions):

Code: Select all

Stockfish 1.6s 32bit    ½½½1111½½0   6.5/10   
Stockfish 1.6 JA 32bit  ½½½0000½½1   3.5/10

65% or +108 ELO for Dann's 32bit version over original.

Code: Select all

Stockfish 1.6s 32bit   ½½½01½½110   5.5/10
Rybka 3 1-cpu 32-bit   ½½½10½½001   4.5/10

55% or +35 ELO for Dann's 32bit version over Rybka 3.

Code: Select all

Rybka 3 1-cpu 32-bit     11½10½01½1   6.5/10
Stockfish 1.6 JA 32bit   00½01½10½0   3.5/10

65% or +108 ELO for Rybka 3 over original Stockfish 1.6.

The last 2 match results are particularly interesting.

►Set-2(15 positions):

Code: Select all

Stockfish 1.6s 32bit    ½½11½½½111010½111½½½½½½110½11½   20.0/30   
Stockfish 1.6 JA 32bit  ½½00½½½000101½000½½½½½½001½00½   10.0/30

66.7% or +120 ELO for Dann's 32bit version over original.

Code: Select all

Stockfish 1.6s 32bit   ½½10½1½½0½½½½½110½½½   10.5/20
Rybka 3 1-cpu 32-bit   ½½01½0½½1½½½½½001½½½    9.5/20

10 games remaining. Still running....
52.5% or +17 ELO for Dann's 32bit version over Rybka 3.

Code: Select all

Rybka 3 1-cpu 32-bit    1½1½10½½11½0½½½1½10½    12.0/20
Stockfish 1.6 JA 32bit  0½0½01½½00½1½½½0½01½     8.0/20

10 games remaining. Still running....
60% or +70 ELO for Rybka 3 over original Stockfish 1.6.

Thats is for 32bit and 1 CPU.
Perhaps for 64bit and 2 or 4 CPU things are different. Or perhaps things are different for 32bit also and it was the predefined positions i made them run and with other different positions things would be completely different.

[Edward German]

Where is the 32bit JA version with new changes ?

My Version I found here:

32-bit:

http://cap.connx.com/chess-engines/new- ... 32.exe.bz2

(after Download please "bz2" remame to "zip")

[George Tsavdaris]

Where is the 32bit JA version with new changes ?

My Version I found here:

32-bit:

http://cap.connx.com/chess-engines/new- ... 32.exe.bz2

(after Download please "bz2" remame to "zip")

Notice that the link you gave yesterday had another version.
32bit also. But it was another "less smooth" version. The current link contains again a 32bit Stockfish but modified.

[DomLeste]

1st update from DC for 32bit Stockfish 1.6s

32bit version Scales null move smoothly 328 KB (336,384 bytes)

2nd update

32bit version slightly smoother scaling 326 KB (333,824 bytes)

I have both if anyone wants a link but the differences small i guess.

[Edward German]

Where is the 32bit JA version with new changes ?

My Version I found here:

32-bit:

http://cap.connx.com/chess-engines/new- ... 32.exe.bz2

(after Download please "bz2" remame to "zip")

Notice that the link you gave yesterday had another version.
32bit also. But it was another "less smooth" version. The current link contains again a 32bit Stockfish but modified.

I do not know which version 32-Bit this is, but I scored on my only Core Duo 2.6 Ghz on playchess with it very well! It works very good on my PC.

Here are my last games (my nick here is Wolkenlos, and I am starting in Blitz with playchess Rating 2411, before I won a Bullet-Game agaist Rybka):

[Event "Wertungspartie, 2m + 0s"]
[Site "Maschinenraum"]
[Date "2009.12.30"]
[Round "?"]
[White "Wolkenlos, Stockfish 1.6s 32-B"]
[Black "Weintrinker, Rybka 3 Dynamic 1-c"]
[Result "1-0"]
[ECO "D46"]
[BlackElo "2270"]
[PlyCount "117"]
[EventDate "2009.06.19"]

1. d4 d5 2. c4 c6 3. Nf3 e6 4. Nc3 Nf6 5. e3 Nbd7 6. Qc2 Bd6 7. Bd3 O-O 8. O-O
dxc4 9. Bxc4 a6 10. Rd1 b5 11. Bd3 Bb7 12. Ng5 h6 13. Nge4 Be7 14. Nxf6+ Nxf6
15. Ne4 Nxe4 16. Bxe4 f5 17. Bf3 b4 18. Bd2 a5 19. a3 Qd6 20. Qb3 Rfd8 21. Rac1
Kh8 22. axb4 axb4 23. Rc4 Qb8 24. Bxc6 e5 25. Bxb7 Qxb7 26. Qd3 Qb5 27. b3 e4
28. Qc2 Bd6 29. Rc1 Kh7 30. Be1 Ra3 31. h3 Rd7 32. Rc6 g6 33. Qc4 Qxc4 34. bxc4
b3 35. Rb1 Bc7 36. Rc5 f4 37. Rb5 fxe3 38. fxe3 b2 39. Kf2 Bd8 40. R5xb2 Kg7
41. Ke2 Kf6 42. Bb4 Ra4 43. Rf1+ Ke6 44. d5+ Ke5 45. Rf8 h5 46. d6 Ba5 47. Ra8
Bxb4 48. Rxa4 Bxd6 49. Ra6 Rc7 50. Rd2 Rxc4 51. Raxd6 Rc5 52. Rxg6 Rc8 53. Ra2
Kf5 54. Raa6 h4 55. g4+ hxg3 56. h4 Rc2+ 57. Kd1 Rc6 58. Raxc6 g2 59. Rg5# 1-0

[Event "Wertungspartie, 3m + 0s"]
[Site "Maschinenraum"]
[Date "2009.12.30"]
[Round "?"]
[White "Wolkenlos, Stockfish 1.6s 32-B"]
[Black "Knight Krome, Rybka 3 1-cpu 32-bi"]
[Result "1/2-1/2"]
[ECO "D46"]
[WhiteElo "2438"]
[BlackElo "2386"]
[PlyCount "163"]
[EventDate "2009.02.04"]

1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 e6 5. e3 Nbd7 6. Qc2 Bd6 7. Bd3 O-O 8. O-O
dxc4 9. Bxc4 a6 10. Rd1 b5 11. Bd3 Bb7 12. Ng5 Bxh2+ 13. Kxh2 Ng4+ 14. Kg1 Qxg5
15. f3 Ngf6 16. e4 Qh4 17. Be3 e5 18. Ne2 Nh5 19. Qd2 h6 20. b4 Rfe8 21. a4 Qe7
22. Qe1 Red8 23. Rac1 bxa4 24. Ra1 Qf6 25. Rxa4 Nf4 26. Bxf4 exf4 27. Ra5 g5
28. Rda1 Nf8 29. Bxa6 Qe7 30. b5 cxb5 31. Bxb5 Rxa5 32. Rxa5 Rc8 33. Ra7 Rc7
34. Kf1 Ne6 35. Ra5 g4 36. Bd3 gxf3 37. gxf3 Bc8 38. Ra2 Qd6 39. Qf2 Ng5 40.
Ra5 Bh3+ 41. Kg1 Qb4 42. Ra8+ Rc8 43. Rxc8+ Bxc8 44. Kg2 Qd2 45. Bb5 Bh3+ 46.
Kh2 Bg4 47. fxg4 f3 48. Bc4 fxe2 49. Qxe2 Qf4+ 50. Kg2 Nxe4 51. Bb3 Qg3+ 52.
Kf1 Ng5 53. Bd1 Qf4+ 54. Qf2 Qe4 55. Qd2 Nf3 56. Qe2 Qxe2+ 57. Kxe2 Nxd4+ 58.
Kd3 Nc6 59. Ke4 Kg7 60. Ba4 Ne7 61. Bb3 Kf6 62. Kf3 Nc6 63. Kg3 Nd4 64. Bd5 Ne6
65. Bc4 Ng5 66. Kf4 Nh7 67. Kg3 Kg7 68. Kf4 Kf8 69. Kf5 Ke7 70. Ba2 Ng5 71. Bd5
Ne6 72. Bxe6 fxe6+ 73. Kg6 e5 74. Kxh6 e4 75. g5 e3 76. g6 e2 77. g7 e1=Q 78.
g8=Q Qh4+ 79. Kg6 Qg4+ 80. Kh7 Qh5+ 81. Kg7 Qe5+ 82. Kg6 1/2-1/2

[Event "Wertungspartie, 3m + 0s"]
[Site "Maschinenraum"]
[Date "2009.12.30"]
[Round "?"]
[White "Thamover, Rybka 3"]
[Black "Wolkenlos, Stockfish 1.6s 32-B"]
[Result "1/2-1/2"]
[ECO "B49"]
[WhiteElo "2701"]
[BlackElo "2436"]
[PlyCount "124"]
[EventDate "2009.02.04"]

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nc6 5. Nc3 Qc7 6. Be2 a6 7. Nxc6 bxc6 8.
O-O Nf6 9. Be3 Bb4 10. a3 Bxc3 11. bxc3 d5 12. exd5 cxd5 13. c4 Bb7 14. Qd4 e5
15. Qb6 Qxb6 16. Bxb6 O-O 17. f4 e4 18. cxd5 Nxd5 19. Ba5 Bc6 20. c4 Ne3 21.
Rfc1 Nf5 22. Rab1 Nd4 23. Bf1 Ne6 24. Rb6 Rfc8 25. Bd2 Nc5 26. Be3 Na4 27. Rbb1
Rd8 28. c5 Kf8 29. f5 Rdb8 30. g4 Rxb1 31. Rxb1 Nc3 32. Rb3 Nd5 33. Kf2 Ke7 34.
Bd4 g6 35. Bc4 Rd8 36. Bxa6 gxf5 37. gxf5 Nc7 38. Rb6 Rxd4 39. Rxc6 Nxa6 40.
Rxa6 Rc4 41. Ke3 Rxc5 42. Kxe4 Rc2 43. h4 Rc4+ 44. Ke5 Rc5+ 45. Kf4 f6 46. Kg4
Rc4+ 47. Kh5 Rc5 48. Ra7+ Kd6 49. Rxh7 Rxf5+ 50. Kg6 Rf4 51. a4 Ke6 52. a5 Rg4+
53. Kh5 Ra4 54. Ra7 Ke5 55. Ra8 Ke6 56. Ra6+ Kf5 57. Kh6 Rxh4+ 58. Kg7 Rg4+ 59.
Kf7 Ra4 60. Ra8 Ke5 61. a6 Kd5 62. Kg7 f5 1/2-1/2

[Event "Wertungspartie, 3m + 0s"]
[Site "Maschinenraum"]
[Date "2009.12.30"]
[Round "?"]
[White "Wolkenlos, Stockfish 1.6s 32-B"]
[Black "Thamover, Rybka 3"]
[Result "1/2-1/2"]
[ECO "D46"]
[WhiteElo "2475"]
[BlackElo "2687"]
[PlyCount "126"]
[EventDate "2009.02.04"]

1. d4 d5 2. Nf3 Nf6 3. c4 e6 4. e3 c6 5. Nc3 Nbd7 6. Qc2 Bd6 7. Bd3 O-O 8. O-O
dxc4 9. Bxc4 a6 10. Rd1 b5 11. Bd3 Bb7 12. Ng5 h6 13. Nge4 Bc7 14. b3 Qe7 15.
Bb2 Ne8 16. Ne2 Nef6 17. g3 Nd5 18. a3 Rfd8 19. Nf4 N5f6 20. a4 Rac8 21. Rac1
Bb6 22. Qe2 Nd5 23. Nh5 g6 24. Nf4 e5 25. dxe5 Nxe5 26. Bb1 Rb8 27. Ba1 bxa4
28. bxa4 Kf8 29. Ba2 Ba7 30. a5 Ba8 31. Rd2 Bb7 32. Rcd1 Bc8 33. Nxd5 cxd5 34.
Bxe5 Qxe5 35. Rxd5 Rxd5 36. Bxd5 Bh3 37. Qc4 Rd8 38. Nc3 Kg7 39. Qh4 Rd6 40.
Qxh3 Qxc3 41. Qf1 Bc5 42. Bb7 Rf6 43. Qe1 Bb4 44. Qxc3 Bxc3 45. Rd5 Bb4 46. e4
Rd6 47. Rxd6 Bxd6 48. Bxa6 Bb4 49. f4 Bxa5 50. Kf2 f6 51. Bc4 g5 52. Bd5 Bc7
53. Ke3 h5 54. Bb3 h4 55. Kf3 hxg3 56. hxg3 gxf4 57. gxf4 Kf8 58. Bd5 Ke7 59.
Ke3 Kd6 60. Ba2 Kc5 61. Be6 Bb6 62. Bc8 Kc4+ 63. Ke2 Kd4 1/2-1/2

This Version can not be bad also.

My Best!
Eduard