Ed Does it Again! (and a question for Ed)

[mjlef]

I see Ed has finished up his writeup on how Rebel plays chess:

http://www.top-5000.nl/authors/rebel/chess840.htm

Great stuff! Now I owe him even more meals.

One section which concerns me a bit is this:

<quote>
Rule no. 1 in pawn endings: the side with a pawn up will win the game. The below code (or something similar) is a must have in every chess program:

int pawn[] = { 0x00,0x00,0x100,0x200,0x300,0x400,0x500,0x600,0x700 };
if (pawn_ending)
{ score=score+pawn[number_of_white_pawns];
score=score-pawn[number_of_black_pawns];
}

Effect: the difference in pawns is the bonus in pawns.

Remark: the rule does not function in case of isolated double pawns, special code is needed to count isolated double pawns as 1 pawn before using the above formula.
</quote>

There are lots of say 1 vs 2 pawn endgames where this rule does not work. The Shredder database site is a good place to find them:

http://www.shredderchess.com/online-che ... abase.html

Example: wk:a3, wp:g2 and h2, bk:e8, bp:h7

Even with white to move this is a draw since the white king is so far away. So Ed, do you have corrections on this rule, or do you just assume the search will find out the truth?

[Steve Maughan]

I see Ed has finished up his writeup on how Rebel plays chess:

Brilliant stuff!! Many thanks Ed!!

Can anyone get it into a PDF format? We need to archive the gold in case it vanishes.

Inspired regards,

Steve

[ed]

File -> Save as...

Ed

[ed]

One can exclude such pawn endings, 2 vs 1 or even 2 vs 3.

Ed

[mclane]

sorry for the question:

is prodeo1.5 beside the speed difference and the opening stuff changed ?
it plays stronger than 1.2.
IMO the difference is so big it cannot only be speed or ECO.

i refer e.g. to the following table:
http://f50.parsimony.net/forum200336/messages/8348.htm

[ed]

sorry for the question:

is prodeo1.5 beside the speed difference and the opening stuff changed ?
it plays stronger than 1.2.
IMO the difference is so big it cannot only be speed or ECO.

i refer e.g. to the following table:
http://f50.parsimony.net/forum200336/messages/8348.htm

Only 18-19 games Thorsten, meaningless

Ed

[mclane]

http://f50.parsimony.net/forum200336/messages/8363.htm

take this: 76 games each

[chessfurby]

If you are >400 games you can start considering the possibility that 1.5 may be stronger.

Cheers

[ed]

http://f50.parsimony.net/forum200336/messages/8363.htm

take this: 76 games each

Played with default settings, so with EOC=on ?

If so, something like this is expected.

Ed

[mclane]

if you are a life - form without a brain, you would maybe need 400 times running against a wall to find out that the wall is stronger than you.