7-men : all 43/43p EGTs created

Endgame analysis using tablebases, EGTB generation, exchange, sharing, discussions, etc..

7-men : all 43/43p EGTs created

Postby kronsteen » Wed Aug 01, 2012 4:02 pm

Big news here :

https://plus.google.com/100454521496393 ... 5718/posts

See also :

http://rybkaforum.net/cgi-bin/rybkaforu ... 24816;pg=5

Questions for the future :

- Distribution of newly created EGTs (43, 43p, 51)
- 43/43p WDL tables (more suitable for near-term widespread distribution & use)
- Distribution / use of new compression format – seems to be very valuable as it compresses 40% better than Nalimov, provided it doesn’t hamper too badly access time – could also apply to 3-6 men with full set shrinked down to 700 GB
- 52/52p creation
- 43-43p stats (tbs files). kqnkrbn should definitely be the 7-men longest checkmate winner with QN4n1/8/3k4/8/b1K5/8/8/6r1 b - - 0 1 (mate in 545)
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Re: 7-men : all 43/43p EGTs created

Postby syzygy » Fri Aug 03, 2012 6:26 pm

syzygy
 
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Re: 7-men : all 43/43p EGTs created

Postby ernest » Sat Aug 04, 2012 11:49 pm


that page does not seem to exist...

kronsteen wrote:kqnkrbn should definitely be the 7-men longest checkmate winner with QN4n1/8/3k4/8/b1K5/8/8/6r1 b - - 0 1 (mate in 545)

I have seen it to be a 517 DTC, but do you have a link for that 545 DTM?
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Re: 7-men : all 43/43p EGTs created

Postby syzygy » Sun Aug 05, 2012 4:31 pm

ernest wrote:

that page does not seem to exist...

The link works for me.

kronsteen wrote:kqnkrbn should definitely be the 7-men longest checkmate winner with QN4n1/8/3k4/8/b1K5/8/8/6r1 b - - 0 1 (mate in 545)

I have seen it to be a 517 DTC, but do you have a link for that 545 DTM?

In this file one can find 8/6R1/8/6N1/3k1K2/1B6/7n/7q w - - with mate in 1090 half moves, i.e. 545 full moves. The positions are different, so I don't know which one is correct. (They could both be.)
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Re: 7-men : all 43/43p EGTs created

Postby ernest » Sun Aug 05, 2012 9:46 pm

syzygy wrote:In this file one can find 8/6R1/8/6N1/3k1K2/1B6/7n/7q w - - with mate in 1090 half moves, i.e. 545 full moves.

Thanks!
Do you know where this file comes from?
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Re: 7-men : all 43/43p EGTs created

Postby syzygy » Sun Aug 05, 2012 11:18 pm

ernest wrote:
syzygy wrote:In this file one can find 8/6R1/8/6N1/3k1K2/1B6/7n/7q w - - with mate in 1090 half moves, i.e. 545 full moves.

Thanks!
Do you know where this file comes from?

See here.
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Re: 7-men : all 43/43p EGTs created

Postby ernest » Mon Aug 06, 2012 12:28 am

syzygy wrote:See here.

OK thanks syzygy!

Now I have no problem finding that
http://rybkaforum.net/cgi-bin/rybkaforu ... 24816;pg=4
but still cannot find your
http://rybkaforum.net/cgi-bin/rybkaforu ... 24816;pg=5
...simply because page 5 does not exist for me in that Rybka forum thread!!! :D
Why that page exists for you (and kronsteen) is a mystery...

Also, looking at
QN4n1/8/3k4/8/b1K5/8/8/6r1 b - - 0 1 (mate in 545)
and
8/6R1/8/6N1/3k1K2/1B6/7n/7q w - - with mate in 1090 half moves, i.e. 545 full moves
the 1st is Black to move, the 2nd is White to move.
So I suppose the "real longest" is the White to move...

Anyway, I find that 7-men subject fascinating.
I hope there will be soon a comprehensive report! (unless you know one that already exists!...).
ernest
 
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Re: 7-men : all 43/43p EGTs created

Postby syzygy » Mon Aug 06, 2012 10:59 pm

ernest wrote:
syzygy wrote:See here.

OK thanks syzygy!

Now I have no problem finding that
http://rybkaforum.net/cgi-bin/rybkaforu ... 24816;pg=4
but still cannot find your
http://rybkaforum.net/cgi-bin/rybkaforu ... 24816;pg=5
...simply because page 5 does not exist for me in that Rybka forum thread!!! :D
Why that page exists for you (and kronsteen) is a mystery...

Maybe clear your browser cache or try with a different browser?

Also, looking at
QN4n1/8/3k4/8/b1K5/8/8/6r1 b - - 0 1 (mate in 545)
and
8/6R1/8/6N1/3k1K2/1B6/7n/7q w - - with mate in 1090 half moves, i.e. 545 full moves
the 1st is Black to move, the 2nd is White to move.
So I suppose the "real longest" is the White to move...

If both are correct, they are both equally long. It is true that the side to move is different, but the colors of the pieces are inverted as well.
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Re: 7-men : all 43/43p EGTs created

Postby ernest » Tue Aug 07, 2012 7:02 pm

syzygy wrote:Maybe clear your browser cache or try with a different browser?

I think it simply has to do with the Posts Per Page option of the Rybka Forum. In my case, I have it at 70.
How much is it in your case? (maybe default is 60?)

It is true that the side to move is different, but the colors of the pieces are inverted as well.

Good remark! I didn't see that...
So apparently there are (at least) two KRBNKQN positions with Mate in 545 (for KRBN side to move)!
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Re: 7-men : all 43/43p EGTs created

Postby syzygy » Wed Aug 08, 2012 7:12 pm

ernest wrote:
syzygy wrote:Maybe clear your browser cache or try with a different browser?

I think it simply has to do with the Posts Per Page option of the Rybka Forum. In my case, I have it at 70.
How much is it in your case? (maybe default is 60?)

Ok, that explains. I don't have an account on RF, so I guess it's set to whatever is the default.
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