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Subject: Re: If you like to solve mate for light position...

Author: leonid

Date: 09:09:52 02/11/01

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On February 11, 2001 at 08:19:40, Tim Foden wrote:

>On February 11, 2001 at 07:41:00, leonid wrote:
>
>>Hi!
>>
>>If you like to solve a mate, you can try the next one:
>>
>>[D]3n1nbk/5qpp/2Q2nq1/1pbQNBB1/p1p1QNn1/2B2Q2/1PP1P3/2K4R w - -
>>
>>Please, say your result.
>
>Hi Leonid,

Hi, Tim!

>Green Light Chess v2.13-pr1 finds a mate in 9 ater 10.51 seconds,
>and then finds a shorter mate in 8 after 20.73 seconds.  It sticks
>with this for a full 15 mins.  I guess we'll have to wait for other
>results to see if a shorter mate is found, or proven not to exist by
>chest.

My selective was not that good here. Speediest for selective found in 11 moves
at 1.4 sec. The most probable that my selective can't find nothing below this.
At least, I disconnected more deep selective when I found that it take more that
1 min.


>Cheers, Tim.
>
>Analysis, GLC 2.13-pr1, 24MB hash, 920MHz Duron:
>
>>anal
> Game stage: Opening
> Current eval: 18.38
> Ply  Time  Score   Nodes  Principal Variation
>  3   0.01  29.64    5045  Nfxg6+ Qxg6 Nxg6+ Nxg6 Rxh7+ Bxh7
>  3   0.02  29.64    5184  Nfxg6+ Qxg6 Nxg6+ Nxg6 Rxh7+ Bxh7
>  4   0.05  29.69   15017  Nfxg6+ Qxg6 Nxg6+ Nxg6 Rxh7+ Bxh7 Qxd8+ Bg8
>  4   0.09  29.69   28281  Nfxg6+ Qxg6 Nxg6+ Nxg6 Rxh7+ Bxh7 Qxd8+ Bg8
>  5   0.53     --  279496  Nfxg6+  (a=29.19 b=30.19 e=29.19)
>  5   0.54     ++  282935  Nfxg6+  (a=-321.00 b=29.20 e=29.20)
>  5   0.55  29.22  288504  Nfxg6+ Qxg6 Nxg6+ Nxg6 Bgxf6 Be3+ Qfxe3 Bxd5
>  5   0.55  29.22  288589  Nfxg6+ Qxg6 Nxg6+ Nxg6 Bgxf6 Be3+ Qfxe3 Bxd5
>  6   0.56     ++  292411  Nfxg6+  (a=28.72 b=29.72 e=29.72)
>  6   0.76  33.19  417592  Nfxg6+ Qxg6 Nxg6+ Nxg6 Bgxf6 Nxf6 Qxf6 Bf8 Rxh7+
>                             Bxh7 Qfxd8
>  6   1.28  33.19  793375  Nfxg6+ Qxg6 Nxg6+ Nxg6 Bgxf6 Nxf6 Qxf6 Bf8 Rxh7+
>                             Bxh7 Qfxd8
>  7   1.32     ++  805216  Nfxg6+  (a=32.69 b=33.69 e=33.69)
>  7   2.43  36.34 1614187  Nfxg6+ Nxg6 Nxf7+ Nxf7 Bgxf6 Nxf6 Qxf6 Bd4 Qxg6 Nh6
>                             Qge8
>  7   5.08  36.34 3523071  Nfxg6+ Nxg6 Nxf7+ Nxf7 Bgxf6 Nxf6 Qxf6 Bd4 Qxg6 Nh6
>                             Qge8
>  8   5.21     ++ 3602654  Nfxg6+  (a=35.84 b=36.84 e=36.84)
>  8  10.51 320.83 7709270  Nfxg6+ Nxg6 Nxg6+ Qxg6 Qxg8+ Kxg8 Bxg6 Bf8 Qcd5+ Kh8
>                             Rxh7+ Nxh7 Qg8+ Kxg8 Bxh7+ Kh8 Qxf8# <ht>
>  8  16.66 320.83  13745k  Nfxg6+ Nxg6 Nxg6+ Qxg6 Qxg8+ Kxg8 Bxg6 Bf8 Qcd5+ Kh8
>                             Rxh7+ Nxh7 Qg8+ Kxg8 Bxh7+ Kh8 Qxf8# <ht>
>  9  20.73 320.85  18003k  Nfxg6+ Nxg6 Nxg6+ Qxg6 Qxg8+ Kxg8 Bxg6 Bf8 Qee8 Nxc6
>                             <ht>
>  9  33.64 320.85  31079k  Nfxg6+ Nxg6 Nxg6+ Qxg6 Qxg8+ Kxg8 Bxg6 Bf8 Qee8 Nxc6
>                             <ht>
> 10  46.11 320.85  44792k  Nfxg6+ Nxg6 Nxg6+ Qxg6 Qxg8+ Kxg8 Bxg6 Bf8 Qee8 Nxc6
>                             Bxh7+ Kh8 Qxf8+ Ng8 Qxg8# <ht>
> 10   1:33 320.85  95317k  Nfxg6+ Nxg6 Nxg6+ Qxg6 Qxg8+ Kxg8 Bxg6 Bf8 Qee8 Nxc6
>                             Bxh7+ Kh8 Qxf8+ Ng8 Qxg8# <ht>
> 11   2:07 320.85 131947k  Nfxg6+ Nxg6 Nxg6+ Qxg6 Qxg8+ Kxg8 Bxg6 Bf8 Qee8 Nxc6
>                             Bxh7+ Kh8 Qxf8+ Ng8 Qxg8# <ht>
> 11   5:39 320.85 362972k  Nfxg6+ Nxg6 Nxg6+ Qxg6 Qxg8+ Kxg8 Bxg6 Bf8 Qee8 Nxc6
>                             Bxh7+ Kh8 Qxf8+ Ng8 Qxg8# <ht>
> 12   7:12 320.85 465267k  Nfxg6+ Nxg6 Nxg6+ Qxg6 Qxg8+ Kxg8 Bxg6 Bf8 Qee8 Nxc6
>                             Bxh7+ Kh8 Qxf8+ Ng8 Qxg8# <ht>
> 12  15:05 320.85 979669k  Nfxg6+ Nxg6 Nxg6+ Qxg6 Qxg8+ Kxg8 Bxg6 Bf8 Qee8 Nxc6
>                             Bxh7+ Kh8 Qxf8+ Ng8 Qxg8# <ht>
> 13  15:35   0/77          Nfxg6+ >exit
> local:  t=15:41  nps=1083291.8  n=1020411074  (f=240107661  q=780303413)
> total:  t=15:41  nps=1083291.8  n=1020411074  draws=91764

This is where I am very curious to ask you one question. Is this just like I
read it? Your program see 1083291 nodes/second?

It is too far from what I can expect from my NPS. I don't know exactly speed for
this position for my mate solver, since I don't install it but I can guess what
it can be after second part of my program. There I have counter.

Cheers,
Leonid.

> trans:  probes=112029910  hits=9201810 (8.21%)  draft=7150131 (6.38%)
> tcuts:  exact=502 (0.00%)  upper=3102575 (2.77%)  lower=3993515 (3.56%)
> tstor:  exact=1151 (0.00%)  upper=23363721 (59.79%)  lower=15711435 (40.21%)
> ext:  check=81987653  recap=1071090  ppush=966  1rep=2664045  thrt=0
> q-moves:  gen=4644993  tested=830649  made/un=164207  max-dep=10
> max eval diff:  part-1=2.36  part-2=1.71



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