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Subject: Re: Chess program improvement project (copy at Winboard::Programming)

Author: Dann Corbit

Date: 10:40:42 03/07/06

Go up one level in this thread


On March 07, 2006 at 04:14:01, Richard Pijl wrote:

>>Even more amazing would be the program which also finds Alec Szabo's brilliant
>>refutation.
>>
>>[D]2b5/8/4p1p1/1k1pP1P1/p2P4/Bpp3K1/1R3P2/8 w - - bm Re2; id "WAC.230 after Rb4
>>cxb4 a4 b5+ Kxb5 Ba3 c3"; c0 "possibly drawish";
>
>The Baron 1.8.0, 5-stone EGTB, 100Mb hash, Xeon 2.8 Ghz (1 CPU), found within 3
>seconds:

I meant from the WAC.230 starting point!
Let's see how long it takes from here to find it:
[D]2b5/1r6/2kBp1p1/p2pP1P1/2pP4/1pP3K1/1R3P2/8 b - - bm Rb4; id "WAC.230";

> ply       time        nodes   score  pv
>  2( 5)-   0:00.02       263   -1.51  Rb2-b1 (Kb5-c4)
>  2( 5)&   0:00.02       280   -1.81  Rb2-b1 Kb5-c4
>  2( 5).   0:00.02       323   -1.81  Rb2-b1 Kb5-c4
>  3( 4)+   0:00.02       404   -1.33  Rb2-b1 (Kb5-c4) (Kg3-f4)
>  3( 4)&   0:00.02       474   -1.28  Rb2-b1 Kb5-c4 Kg3-f4
>  3( 5).   0:00.03       986   -1.28  Rb2-b1 Kb5-c4 Kg3-f4
>  4( 5)&   0:00.03      1136   -1.35  Rb2-b1 Kb5-c4 Kg3-f4 Kc4-d3
>  4( 6).   0:00.03      2013   -1.35  Rb2-b1 Kb5-c4 Kg3-f4 Kc4-d3
>  5( 8)&   0:00.03      3260   -1.67  Rb2-b1 Kb5-c4 Kg3-f4 c3-c2 Rb1-c1
>                                      Kc4-c3
>  5( 8).   0:00.03      6075   -1.67  Rb2-b1 Kb5-c4 Kg3-f4 c3-c2 Rb1-c1
>                                      Kc4-c3
>  6(11)&   0:00.05     10701   -1.34  Rb2-b1 Kb5-c4 Kg3-f4 Kc4-d3 Rb1-d1
>                                      Kd3-c2 Rd1-c1 Kc2-d3
>  6(11).   0:00.08     17743   -1.34  Rb2-b1 Kb5-c4 Kg3-f4 Kc4-d3 Rb1-d1
>                                      Kd3-c2 Rd1-c1 Kc2-d3
>  7(12)&   0:00.13     31446   -1.39  Rb2-b1 Kb5-c4 Kg3-f3 Kc4-d3 Rb1-d1
>                                      Kd3-c2 Rd1-c1 Kc2-d2 Rc1-b1
>  7(12).   0:00.16     46852   -1.39  Rb2-b1 Kb5-c4 Kg3-f3 Kc4-d3 Rb1-d1
>                                      Kd3-c2 Rd1-c1 Kc2-d2 Rc1-b1
>  8(13)&   0:00.27     79081   -1.48  Rb2-b1 Kb5-c4 Kg3-f3 Kc4-d3 Kf3-f4
>                                      Bc8-a6 Rb1-d1 Kd3-c2 Rd1-c1 Kc2-d2
>  8(13).   0:00.33    109558   -1.48  Rb2-b1 Kb5-c4 Kg3-f3 Kc4-d3 Kf3-f4
>                                      Bc8-a6 Rb1-d1 Kd3-c2 Rd1-c1 Kc2-d2
>  9(18)-   0:00.89    313040   -1.83  Rb2-b1 (Kb5-c4) (Kg3-f3) (Kc4xd4) (Rb1-d1)
>                                      (Kd4-c4) (Kf3-e3) (b3-b2) (f2-f3) (Bc8-d7)
>  9(18)&   0:01.28    432276   -1.93  Rb2-b1 Kb5-c4 f2-f4 Kc4xd4 Rb1-e1
>                                      Kd4-c4 f4-f5 b3-b2 f5xg6
>  9(18).   0:01.44    511525   -1.93  Rb2-b1 Kb5-c4 f2-f4 Kc4xd4 Rb1-e1
>                                      Kd4-c4 f4-f5 b3-b2 f5xg6
> 10(16)&   0:02.94    987117   -2.20  Rb2-e2 Kb5-c4 f2-f4 Kc4xd4 Kg3-f3
>                                      Bc8-a6 Re2-f2 Ba6-d3 Rf2-h2 Kd4-c4
> 10(16).   0:03.05   1050640   -2.20  Rb2-e2 Kb5-c4 f2-f4 Kc4xd4 Kg3-f3
>                                      Bc8-a6 Re2-f2 Ba6-d3 Rf2-h2 Kd4-c4
> 11(16)+   0:03.50   1174069   -1.85  Rb2-e2 (Kb5-c4) (f2-f4) (Kc4xd4) (f4-f5)
>                                      (e6xf5) (e5-e6) (Bc8xe6) (Re2xe6) (b3-b2)
>(Re6-b6)
> 11(16)&   0:04.05   1353151   -1.41  Rb2-e2 Kb5-c4 f2-f4 Kc4xd4 f4-f5
>                                      e6xf5 e5-e6 Kd4-c4 e6-e7 Bc8-d7 Kg3-f3
>                                      d5-d4 Ba3-d6
> 11(16).   0:04.63   1558674   -1.41  Rb2-e2 Kb5-c4 f2-f4 Kc4xd4 f4-f5
>                                      e6xf5 e5-e6 Kd4-c4 e6-e7 Bc8-d7 Kg3-f3
>                                      d5-d4 Ba3-d6
> 12(18)&   0:06.55   2187239   -1.61  Rb2-e2 Kb5-c4 f2-f4 Kc4xd4 f4-f5
>                                      e6xf5 e5-e6 Kd4-c4 e6-e7 Bc8-d7 Kg3-f4
>                                      d5-d4 Re2-e1 d4-d3
> 12(18).   0:07.77   2668845   -1.61  Rb2-e2 Kb5-c4 f2-f4 Kc4xd4 f4-f5
>                                      e6xf5 e5-e6 Kd4-c4 e6-e7 Bc8-d7 Kg3-f4
>                                      d5-d4 Re2-e1 d4-d3
> 13(19)&   0:11.73   3896537   -1.53  Rb2-e2 Kb5-c4 f2-f4 Kc4xd4 f4-f5
>                                      e6xf5 e5-e6 Kd4-d3 e6-e7 Bc8-d7 Re2-h2
>                                      d5-d4 Rh2-h8 b3-b2 Rh8-b8
> 13(20).   0:15.77   5273324   -1.53  Rb2-e2 Kb5-c4 f2-f4 Kc4xd4 f4-f5
>                                      e6xf5 e5-e6 Kd4-d3 e6-e7 Bc8-d7 Re2-h2
>                                      d5-d4 Rh2-h8 b3-b2 Rh8-b8
> 14(25)+   0:24.11   7698263   -1.18  Rb2-e2 (Kb5-c4) (f2-f4) (Kc4xd4) (f4-f5)
>                                      (e6xf5) (e5-e6) (Kd4-d3) (e6-e7)
>(Bc8-d7)(Re2-h2)
>                                      (d5-d4) (Rh2-h8) (b3-b2) (Rh8-b8)
> 14(25)&   0:30.80   9888743   -1.04  Rb2-e2 Kb5-c4 f2-f4 Kc4xd4 f4-f5
>                                      e6xf5 e5-e6 Kd4-d3 e6-e7 Bc8-d7 Re2-h2
>                                      Bd7-b5 Kg3-f4 d5-d4 Kf4-e5 Kd3-c4
> 14(25).   0:34.30  11224489   -1.04  Rb2-e2 Kb5-c4 f2-f4 Kc4xd4 f4-f5
>                                      e6xf5 e5-e6 Kd4-d3 e6-e7 Bc8-d7 Re2-h2
>                                      Bd7-b5 Kg3-f4 d5-d4 Kf4-e5 Kd3-c4
> 15(24)-   0:58.88  19308107   -1.39  Rb2-e2 (Kb5-c4) (f2-f4) (Kc4xd4) (f4-f5)
>                                      (e6xf5) (e5-e6) (Kd4-d3) (e6-e7)
>(Bc8-d7)(Re2-h2)
>                                      (d5-d4) (Rh2-h8) (Bd7-b5) (Rh8-b8)
>(Bb5-c6) (Kg3-f4)
> 15(24)&   1:20.02  26934835   -1.52  Rb2-e2 Kb5-c4 f2-f4 Kc4xd4 f4-f5
>                                      e6xf5 e5-e6 Kd4-d3 e6-e7 Bc8-d7 Kg3-f3
>                                      Bd7-e8 Re2-e3 Kd3-c4 Re3-e6 d5-d4 Re6-b6
>                                      d4-d3 (Rb6-b4)
> 15(24).   1:53.30  40446576   -1.52  Rb2-e2 Kb5-c4 f2-f4 Kc4xd4 f4-f5
>                                      e6xf5 e5-e6 Kd4-d3 e6-e7 Bc8-d7 Kg3-f3
>                                      Bd7-e8 Re2-e3 Kd3-c4 Re3-e6 d5-d4 Re6-b6
>                                      d4-d3 (Rb6-b4)



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