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Subject: Re: And here's another problem for you (Knightshead4mate Revisited)!

Author: Paul

Date: 05:09:31 01/22/01

Go up one level in this thread


On January 22, 2001 at 04:55:42, Tim Foden wrote:

>On January 21, 2001 at 18:02:44, Paul wrote:
>
>>Here's a problem for you in return my friend, it's not mine however:
>>
>>[D]5n2/B3K3/2p2Np1/4k3/7P/3bN1P1/2Prn1P1/1q6 w - - 0 1
>>
>>The solution is also very funny, but be warned! it's verrrry deep :)
>>Mine solves this instantly ;)
>>
>>Groetjes,
>>Paul
>
>This one at least Green Light manages to find :-)
>This probably confirms that you were telling the truth about it being a mate in
>30, as that is what GLC finds :)

Thanks for the vote of confidence, Tim, needed that ;)

> Current eval: -12.80
> Ply  Time  Score   Nodes  Principal Variation
>  4   0.10   3.91    8787  Neg4+ Kf5 Nh6+ Ke5 Nf7+ Kf5 Nd6+ Ke5 Ng4+ Kd5 c4+
>                             Bxc4 Ne3+ Ke5 Nexc4+ Kd5 Ne3+ Ke5 Ndc4+ Ke4 Nxd2+
>                             Ke5 Nxb1
>  4   0.13   3.91   11123  Neg4+ Kf5 Nh6+ Ke5 Nf7+ Kf5 Nd6+ Ke5 Ng4+ Kd5 c4+
>                             Bxc4 Ne3+ Ke5 Nexc4+ Kd5 Ne3+ Ke5 Ndc4+ Ke4 Nxd2+
>                             Ke5 Nxb1
>  5   0.25   3.93   27485  Neg4+ Kf5 Nh6+ Ke5 Nf7+ Kf5 Nd6+ Ke5 Ng4+ Kd5 c4+
>                             Bxc4 Ne3+ Ke5 Ndxc4+ Ke4 Nxd2+ Ke5 Ng4+ Kf5 Nh6+
>                             Ke5 Nf7+ Kf5
>  5   0.30   3.93   35347  Neg4+ Kf5 Nh6+ Ke5 Nf7+ Kf5 Nd6+ Ke5 Ng4+ Kd5 c4+
>                             Bxc4 Ne3+ Ke5 Ndxc4+ Ke4 Nxd2+ Ke5 Ng4+ Kf5 Nh6+
>                             Ke5 Nf7+ Kf5
>  6   0.59   3.94   86978  Neg4+ Kf5 Nh6+ Ke5 Nf7+ Kf5 Nd6+ Ke5 Ng4+ Kd5 Ne3+
>                             Ke5 Nf7+ Ke4 Ng5+ Ke5 Nf3+ Ke4 Nxd2+ Ke5 Nxb1 Bxc2
>                             Bb8+ Ke4 Nxc2
>  6   0.74   3.94  106624  Neg4+ Kf5 Nh6+ Ke5 Nf7+ Kf5 Nd6+ Ke5 Ng4+ Kd5 Ne3+
>                             Ke5 Nf7+ Ke4 Ng5+ Ke5 Nf3+ Ke4 Nxd2+ Ke5 Nxb1 Bxc2
>                             Bb8+ Ke4 Nxc2
>  7   1.43   4.00  234402  Neg4+ Kf5 Nh6+ Ke5 Nf7+ Kf5 Nd6+ Ke5 Ng4+ Kd5 c4+
>                             Bxc4 Ne3+ Ke5 Ndxc4+ Ke4 Nxd2+ Ke5 Nxb1 Ne6 Bb8+
>                             Kd4 Bd6
>  7   1.74   4.00  287094  Neg4+ Kf5 Nh6+ Ke5 Nf7+ Kf5 Nd6+ Ke5 Ng4+ Kd5 c4+
>                             Bxc4 Ne3+ Ke5 Ndxc4+ Ke4 Nxd2+ Ke5 Nxb1 Ne6 Bb8+
>                             Kd4 Bd6
>  8   2.41     ++  410813  Neg4+   (a=3.50 b=4.50 e=4.50)
>  8   3.42 320.41  603512  Neg4+ Kf5 Nh6+ Ke5 Nf7+ Kf5 Nd6+ Ke5 Ng4+ Kd5 Ne3+
>                             Ke5 Nf7+ Ke4 Ng5+ Ke5 Nf3+ Ke4 Nxd2+ Ke5 Nf3+ Ke4
>                             Ng5+ Ke5 Nf7+ Ke4 Nd6+ Ke5 Ng4+ Kd5 Nf6+ Ke5 Nf7+
>                             Kf5 Nh6+ Ke5 Nhg4+ Kf5 Ne3+ Ke5 Nfg4+ Ke4 Nf2+ Ke5
>                             Nxd3+ Ke4 Nf2+ Ke5 Nfg4+ Ke4 Nf6+ Ke5 Nc4+ Kf5
>                             Nd6+ Ke5 Ng4+ Kd5 c4#
>  8   4.04 320.41  719438  Neg4+ Kf5 Nh6+ Ke5 Nf7+ Kf5 Nd6+ Ke5 Ng4+ Kd5 Ne3+
>                             Ke5 Nf7+ Ke4 Ng5+ Ke5 Nf3+ Ke4 Nxd2+ Ke5 Nf3+ Ke4
>                             Ng5+ Ke5 Nf7+ Ke4 Nd6+ Ke5 Ng4+ Kd5 Nf6+ Ke5 Nf7+
>                             Kf5 Nh6+ Ke5 Nhg4+ Kf5 Ne3+ Ke5 Nfg4+ Ke4 Nf2+ Ke5
>                             Nxd3+ Ke4 Nf2+ Ke5 Nfg4+ Ke4 Nf6+ Ke5 Nc4+ Kf5
>                             Nd6+ Ke5 Ng4+ Kd5 c4#
>  9   4.07   0/27          Neg4+  >exit
> local:  t=7.84  nps=180087.2  n=1412064  (f=384569  q=1027495)
> total:  t=7.84  nps=180087.2  n=1412064  draws=2959
> trans:  probes=381610  hits=124088 (32.52)  draft=36422 (9.54)
> trans:  exact=84 (0.02)  upper=17604 (4.61)  lower=16585 (4.35)
> tstor:  exact=338 (0.20)  upper=108496 (63.45)  lower=62164 (36.35)
> ext:  check=129664  recap=2393  ppush=5  1rep=9057  thrt=0
> q-moves:  gen=381499  tested=195980  made/un=1758  max-dep=4
> max eval diff:  part-1=0.63  part-2=0.76
>
>Cheers, Tim.

Your solution is absolutely correct!! Nice to see all these stats.
You do some aggressive extending!

I checked mine and it only visits 6836 nodes total, and finds it at ply 1.
But this with special extension settings (full ply extend on check/onerep),
and hash off. The sad thing is that when I try it with hash on, mine says
it's a mate in 32!! Now is that a bug or a feature ;?) At the moment I'm
really wrestling to get my Mate/Hash problem right ... also have a problem
combining Hash/EgtbMates; my only consolation is that I saw a few other
posts on the subject the last couple of days, so I'm not the only one ...

Groetjes,
Paul



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