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Old August 30th 07, 02:06 PM posted to rec.games.chess.computer
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Hi,

At http://members.home.nl/matador/chess...#KING%20SAFETY I saw this
table:

+----+----+----+----+-----+----+---+----+ Initialize COUNTER:
8 | 02 | 00 | 00 | 00 | 00 | 00 | 00 | 02 |
+----+----+----+----+----+----+----+----+ COUNTER = TABLE [black_king];
7 | 02 | 01 | 01 | 01 | 01 | 01 | 01 | 02 |
+----+----+----+----+----+----+----+----+ This will avoid the black king
6 | 04 | 03 | 03 | 03 | 03 | 03 | 03 | 04 | to enter the center, as soon
+----+----+----+----+----+----+----+----+ as white has a little pressure
5 | 04 | 04 | 04 | 04 | 04 | 04 | 04 | 04 | on the squares surrounding Kd5
+----+----+----+----+----+----+----+----+ the score will go over 1 or 2
4 | 04 | 04 | 04 | 04 | 04 | 04 | 04 | 04 | pawns with ease.
+----+----+----+----+----+----+----+----+
3 | 04 | 04 | 04 | 04 | 04 | 04 | 04 | 04 | Also, squares like H7, H8 are
+----+----+----+----+----+----+----+----+ set a bit higher because there
2 | 04 | 04 | 04 | 04 | 04 | 04 | 04 | 04 | are less surrounding squares
+----+----+----+----+----+----+----+----+ on the black king, this will
1 | 04 | 04 | 04 | 04 | 04 | 04 | 04 | 04 | avoid moves like Kg8-h8 when
+----+----+----+----+----+----+----+----+ there is absolutely no need
a b c d e f g h
Now I was wondering: is this table a generic one? E.g.: are these values a
general known fact? And if so: do they also exists for the other pieces and
for the other color? Where?


Thank you,

Folkert van Heusden

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Old August 30th 07, 11:13 PM posted to rec.games.chess.computer
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Folkert van Heusden wrote:

Now I was wondering: is this table a generic one? E.g.: are these values a
general known fact? And if so: do they also exists for the other pieces and
for the other color? Where?


You are looking at REBEL's king safety progressive evaluation
prefill table. Of *course* it is speciific to REBEL. Other
programs address king safety differently.

--
Guy Macon
http://www.guymacon.com/


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Old August 31st 07, 08:35 AM posted to rec.games.chess.computer
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First recorded activity by ChessBanter: Jul 2006
Posts: 1,015
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On Aug 30, 2:06 pm, "Folkert van Heusden"
wrote:
Hi,

Athttp://members.home.nl/matador/chess840.htm#KING%20SAFETYI saw this
table:

+----+----+----+----+-----+----+---+----+ Initialize COUNTER:
8 | 02 | 00 | 00 | 00 | 00 | 00 | 00 | 02 |
+----+----+----+----+----+----+----+----+ COUNTER = TABLE [black_king];
7 | 02 | 01 | 01 | 01 | 01 | 01 | 01 | 02 |
+----+----+----+----+----+----+----+----+ This will avoid the black king
6 | 04 | 03 | 03 | 03 | 03 | 03 | 03 | 04 | to enter the center, as soon
+----+----+----+----+----+----+----+----+ as white has a little pressure
5 | 04 | 04 | 04 | 04 | 04 | 04 | 04 | 04 | on the squares surrounding Kd5
+----+----+----+----+----+----+----+----+ the score will go over 1 or 2
4 | 04 | 04 | 04 | 04 | 04 | 04 | 04 | 04 | pawns with ease.
+----+----+----+----+----+----+----+----+
3 | 04 | 04 | 04 | 04 | 04 | 04 | 04 | 04 | Also, squares like H7, H8 are
+----+----+----+----+----+----+----+----+ set a bit higher because there
2 | 04 | 04 | 04 | 04 | 04 | 04 | 04 | 04 | are less surrounding squares
+----+----+----+----+----+----+----+----+ on the black king, this will
1 | 04 | 04 | 04 | 04 | 04 | 04 | 04 | 04 | avoid moves like Kg8-h8 when
+----+----+----+----+----+----+----+----+ there is absolutely no need
a b c d e f g h
Now I was wondering: is this table a generic one? E.g.: are these values a
general known fact? And if so: do they also exists for the other pieces and
for the other color? Where?


It is only true for the King whilst there is some protection from
friendly pawns and/or defensive pieces. Downgrading a8,h8,a7,h7
scores is a kludge to stop King shuffling when the program is a bit
lost. Different programs have other means of encoding King safety. And
there are standard openings where Kh8 is necessary...

The right table varies with the stage of the game and what other
material is present. The King safety table is pretty much reversed
when you get down to KXX vs K endgames. The lone King must in general
stay as close to the centre of the board with as much mobility
preserved as possible if he is to survive. Going to the edge of the
board makes it a helpmate problem. Inbetween there is a gradual
transition as pieces get swapped off where the King must become more
active to hold onto pawns and territory.

Regards,
Martin Brown

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