7-piece tablebase win in 517 moves

[GothicChessInventor]

You mean it could not possibly have been achieved in any less, against best defence!?

That is correct. No faster win is possible if the opponent plays with maximum resistance.

I added some more endings to the page now. Many of these were unpublished with javascript viewers, such as King + 3 Queens vs. King + 2 Queens, and some hilarious arrangements such as King + 4 Knights vs. King + Queen.

[M ANSARI]

What I would like to know is if there is any sort of pattern or concept in these wins that can be useful in OTB play. I know that there is no way humans can see the 500 move win ... but maybe some logical thought is there to at least make a possible mistake by the other side more possible.

[GothicChessInventor]

Every now and then you see Marc making a comment about a "general win" that offers a strategical summary based on observations of the entire set of positions. Also, there is another program out called "Freezer" that generates endgame tablebases that are "restricted subsets" of N-piece endgames. Contact that author for some more information about general knowledge that has been learned.

[playjunior]

I think the point of 50-rule is that in practical top-level games there almost do not happen endgames with a win that would take more than 50 moves.

[vb4]

Hi Ed,

I was just wondering Ed if you or anyone out here knows of anyone who has generated the 5-1 EGTB's. I understand most people think it is a waste of time but it would help me finish up my study on EGTB's.

Any help would be appreciated.

Les

[GothicChessInventor]

Hello Les,

I might be the only site on the internet that shows these 5 versus 1 tablebase wins. The main page is here:

http://www.gothicchess.com/javascript_8 ... dings.html

...but here are links to the specific types of endings you were looking for:

4 knights defeating a queen in 85 moves

http://www.gothicchess.com/javascript_8 ... tml#NNNN_Q

2 Bishops + 2 Knights defeating a queen in 162 moves

http://www.gothicchess.com/javascript_8 ... tml#BBNN_Q

[vb4]

Hi Ed,

Thanks for your links but I am most interested at the moment at 6 piece EGTB's which are 5-1 endgames. Your link appears to have the 7 piece EGTB's which for the moment I dont need but will in the future. Any idea Ed where I can get all the 5-1 six piece EGTB's? Is this something you can run?

Thanks,

Les

[ernest]

Any idea Ed where I can get all the 5-1 six piece EGTB's?

Best place to look:
http://kirr.homeunix.org/chess/discussi ... um.php?f=6

Is this something you can run?

No

[vb4]

Hi Ernest,

I am very familiar with the site you mentioned but decided to ask in this forum since one individual objected to me asking the question periodically telling me that no one is interested in 5-1 EGTB's since any computer would probably win the game without them. I explained my interest was not to use them to enhance playing a game of chess but to complete a study I am doing regarding EGTB's. If you know of anyone that has them or may be able to generate them please get back to me.

Thanks in advance,

Les

[ernest]

Martin Kreuzer generated them, see:

http://kirr.homeunix.org/chess/discussi ... f=6&t=1938

The existing Nalimov code does not allow for use of the 5-1 EGTBs in a search program. Thus Nalimov's code has to be modified...

I never got a good answer to my question:

http://kirr.homeunix.org/chess/discussi ... f=6&t=2343