Colossus 2021b now available

[MartinBryant]

I have just released an updated version of my Colossus engine on my website at http://www.colossusgames.co.uk

Changes include...

Supports Chess960/FRC
'Ponder' now works again
Time control improvements
Tranposition table enhancement
Evaluation function improvements (knowledge and efficiency)

...which my tests indicate amount to about 35 ELO improvement over the previous version 2021a

Enjoy!

[AdminX]

Thank You.

[AdminX]

Steaming a LTC Game (2 Games) vs Zarkov

[Gabor Szots]

Thanks Martin. Fine engine. However, you could improve upon making it even more difficult to find the download link.

[AdminX]

Thanks Martin. Fine engine. However, you could improve upon making it even more difficult to find the download link.

[Brunetti]

...which my tests indicate amount to about 35 ELO improvement over the previous version 2021a

More or less it's the same for me (1'+1"):

Code: Select all

Rank  Elo   ±  Engine                                      Score Games  Wins Draws  Loss  Oppo time stal ille
-------------------------------------------------------------------------------------------------------------
   1. 2829  40 Colossus 2021b 64-bit                         53%   221    87    61    73   +36   0%   0%   0%
   2. 2784  23 Colossus 2021a 64-bit                         52%   708   294   151   263   +18   0%   0%   0%
   3. 2599  96 Colossus 2008b                                93%   134   119    10     5  +555   0%  46%   0%

Alex

[Colin-G]

The previous link in this thread did not work for me.
This one from an old thread did.
http://www.colossusgames.co.uk/chess/co ... essuci.htm

[mclane]

Thanks, the monday is rescued now.

[AdminX]

Game 1 (Banksia GUI)

[pgn]
[Event "Computer event"]
[Site "Somewhere on Earth"]
[Date "2021.10.18"]
[Round "2"]
[White "Zarkov 6.55"]
[Black "Colossus 2021b"]
[Result "0-1"]
[TimeControl "900+1"]
[Time "16:22:41"]
[Board "1"]
[Termination "mate"]
[ECO "D15"]
[Opening "QGD Slav"]

1. Nf3 Nf6 2. c4 c6
3. d4 d5 4. Nc3 {D15: QGD Slav, 4.Nc3} Bf5
5. Qb3 Qb6 {End of opening} 6. c5 {+0.01/1 5489} Qxb3 {+0.31/23 447175 784468753}
7. axb3 {+0.25/16 83371 112452832} Ne4 {+0.23/23 676928 1136512823} 8. Nh4 {+0.37/19 285525 424469893} Bc8 {+0.06/23 413998 701965065}
9. f3 {+0.36/19 285525 419527880} Nxc3 {-0.07/22 179168 312173040} 10. bxc3 {+0.32/19 106349 379380884} e5 {-0.06/23 533434 939012997}
11. e4 {+0.26/19 29 681427543} g6 {-0.07/20 184205 320575027} 12. Bd3 {+0.21/16 123439 393207395} Be6 {-0.14/19 170147 288848843}
13. O-O {+0.18/16 316859 436852693} Bg7 {-0.15/21 451271 730670409} 14. Be3 {+0.16/17 21 580976760} O-O {-0.20/21 286471 466758107}
15. Ra4 {+0.13/17 47984 454109942} Rd8 {-0.11/20 302303 494644946} 16. Bc2 {+0.04/17 49003 471954372} Na6 {-0.31/20 214687 345084743}
17. Rfa1 {+0.10/17 528793 1017118947} Nc7 {-0.81/19 178355 282966100} 18. dxe5 {-0.32/18 1201565 1787690243} Bxe5 {-1.06/21 151768 235285292}
19. Bd4 {-0.55/17 110408 391935682} Bxd4+ {-1.29/23 87069 150392341} 20. cxd4 {-0.79/19 41332 192335669} Nb5 {-1.61/24 256280 458735741}
21. e5 {-0.99/19 17 369503130} Nc3 {-1.62/24 92309 173930263} 22. Rb4 {-1.30/19 160570 389446838} a5 {-1.71/24 93768 164130967}
23. Rxb7 {-1.43/19 149138 365800542} Ne2+ {-1.50/23 69010 125807295} 24. Kf2 {-1.60/19 164637 345792168} Nxd4 {-1.69/24 65850 119416859}
25. Bd1 {-1.52/19 157569 326799634} g5 {-1.96/24 101432 181133915} 26. Ra4 {-1.71/19 112202 293758756} Nb5 {-2.04/23 84714 156559953}
27. Bc2 {-1.82/18 121970 283482880} gxh4 {-2.03/22 98492 179648714} 28. Rxh4 {-2.04/18 100630 258471325} h6 {-1.99/20 62944 117122025}
29. Rb6 {-1.87/17 192906 248863916} Kg7 {-2.22/21 133873 249788794} 30. Bd3 {-2.01/17 180911 239697606} Nc3 {-2.37/21 207544 390981530}
31. Rxc6 {-2.16/16 15 245449497} Rdb8 {-2.60/21 104367 190709860} 32. Rb6 {-2.42/16 65353 196443878} Rxb6 {-2.68/23 123270 234717742}
33. cxb6 {-2.71/19 28319 196677276} Rb8 {-2.88/23 50769 101321216} 34. Ke3 {-2.75/18 113221 225668757} Rxb6 {-3.16/24 57799 113460545}
35. Bc2 {-2.74/18 99175 224513389} a4 {-3.14/24 70473 146553620} 36. bxa4 {-2.49/19 150846 223934848} Rb2 {-3.23/24 64366 123802920}
37. Kd3 {-2.96/18 77109 190843063} Na2 {-3.23/22 33166 63981939} 38. Bd1 {-3.09/18 103550 190548200} Rxg2 {-3.23/22 62309 118474742}
39. Rf4 {-3.27/17 67998 176280189} Rxh2 {-3.79/23 67516 123888904} 40. a5 {-3.68/18 58607 173221161} Bd7 {-3.79/21 51607 95495812}
41. Ke3 {-4.02/20 970912 1460500559} Nc3 {-4.52/25 450539 802332371} 42. Bb3 {-4.46/19 61362 702590510} Ne2 {-4.54/23 250819 463031350}
43. Rf6 {-4.51/19 257307 681306325} Be6 {-4.78/24 504686 952297642} 44. Ba4 {-4.70/19 20 676378655} d4+ {-5.27/24 498242 910869588}
45. Kd3 {-4.60/19 492179 739234432} Nc1+ {-5.38/24 189002 338902914} 46. Kxd4 {-4.52/19 461480 723084604} Ra2 {-5.47/24 504444 928823962}
47. Bb5 {-4.84/19 20 763446601} Rxa5 {-5.50/23 232315 440862874} 48. Bf1 {-4.83/19 200436 701361364} Nb3+ {-5.96/24 285465 503298698}
49. Kc3 {-5.25/20 420292 709891921} Rxe5 {-6.21/26 322571 576370521} 50. Rf4 {-6.15/19 394089 644619384} Re3+ {-6.31/24 174203 331335000}
51. Kc2 {-6.22/20 195310 570103531} Rxf3 {-16.84/24 271869 483697197} 52. Rxf3 {-6.41/20 85499 511718833} Nd4+ {-158.00/30 129852 231419703}
53. Kd2 {-6.56/19 222237 508997749} Nxf3+ {-158.00/30 152174 293618122} 54. Ke3 {-6.76/19 186086 487882112} Kf6 {-158.00/28 245707 519570426}
55. Kxf3 {-3.20/23 326699 548459812} h5 {-3.15/36 129426 484885975} 56. Kf4 {-2.87/25 306344 533516706} h4 {-4.34/37 201656 747863338}
57. Bg2 {-2.94/24 85599 479597736} Ke7 {-4.57/37 100968 323855953} 58. Be4 {-3.15/24 186062 497957811} f6 {-6.56/35 185081 603514060}
59. Bd3 {-3.24/24 85316 425900173} Kd6 {-7.55/37 191790 681813962} 60. Bf1 {-3.56/24 265139 459371214} h3 {-4.92/34 117879 330325935}
61. Kg3 {-3.07/27 248635 522466203} Kc5 {-7.05/43 97577 315708318} 62. Kh2 {-3.30/27 135576 465652138} Kd4 {-7.96/43 86530 280041015}
63. Kg3 {-3.20/26 138204 455004750} Bf5 {-8.20/43 163217 547227669} 64. Kh2 {-3.32/26 52940 404235946} Ke4 {-8.08/41 253043 896655912}
65. Bc4 {-4.24/27 877569 1874158104} Kf4 {-7.71/38 106571 416160148} 66. Be2 {-5.00/26 233514 456567470} Bg4 {-7.70/34 70728 257555936}
67. Bc4 {-13.09/25 414569 750106121} f5 {-19.63/35 827419 2073457345} 68. Ba2 {-12.18/25 117763 218274131} Ke5 {-158.00/29 41997 100595539}
69. Bb3 {+0.01/1 10} f4 {-158.00/29 43785 103387955} 70. Ba2 {+0.01/1 10} f3 {-158.00/24 47501 110948851}
71. Bb3 {+0.01/1 10} f2 {-158.00/24 40534 92093020} 72. Ba2 {+0.01/1 10} f1=Q {M+8/33 40334 102776737}
73. Bb3 {+0.01/1 10} Qg2# {M+1/120 34649 3006134} 0-1[/pgn]

[mclane]

Brilliant.
Seems this one is a breakthrough