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Normal Topic help me. (Read 993 times)
an ordinary chessplayer
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Re: help me.
Reply #3 - 01/18/18 at 23:40:48
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@GMTonyKosten - he has done it before:
http://www.chesspub.com/cgi-bin/chess/YaBB.pl?num=1515742112
  
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an ordinary chessplayer
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I used to be not bad.

Posts: 600
Location: Columbus, OH (USA)
Joined: 01/02/15
Re: help me.
Reply #2 - 01/18/18 at 23:34:54
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Wikipedia says castling is not included by design. En passant is included.
https://en.wikipedia.org/wiki/Endgame_tablebase#Captures,_pawn_promotion,_and_sp...

Edited:
This next comment is obviously wrong, but I will leave it intact so people can see exactly who they are dealing with.

To your second point, the 50 move rule does include no change in castling eligibility.
« Last Edit: 01/19/18 at 01:40:25 by an ordinary chessplayer »  
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GMTonyKosten
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Re: help me.
Reply #1 - 01/18/18 at 21:51:58
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An interesting observation, but the title isn't that descriptive, is it alright if I change it to something like 'missing SyZyGy position'?
  
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petertohen
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help me.
01/12/18 at 07:22:30
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A minor observation that the Endgame Tablebases which advertise as having "all 5-piece" positions are a lying a little bit.
Here, as FEN, is a 5-piece position the SyZyGy Endgame Tablebases lack:

r3k3/8/4PK2/8/8/8/1R6/8 b q - 0 1

The crucial element in the preceding FEN is the 'q' which means Black can castle ooo (ke8-c8) if he likes.
For SyZyGy to include the position, the 'q' must be replaced with a '-', as in:

r3k3/8/4PK2/8/8/8/1R6/8 b - - 0 1

I have always felt the 50 move rule should include "No change in castling eligibility", along with "No pawn moves" etc.
I suppose the argument is over what the best definition of 'position' should be.
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