Piece values

Technical questions regarding Openings, Middlegames, Endings etc.
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soheil_hooshdaran
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Piece values

Post by soheil_hooshdaran » Wed Apr 18, 2018 12:08 pm

Hi.
What's the basis for assigning numerical values 1-3-5-9 to pieces?

Roger de Coverly
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Re: Piece values

Post by Roger de Coverly » Wed Apr 18, 2018 1:07 pm

soheil_hooshdaran wrote:
Wed Apr 18, 2018 12:08 pm
What's the basis for assigning numerical values 1-3-5-9 to pieces?
Lost in the mists of time I should imagine.

It seems to work as a broad rule of thumb for a basic evaluation. The earliest writings on chess theory were by Philidor and then later by Staunton. Did these authors propose theories of piece value?


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Michael Farthing
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Re: Piece values

Post by Michael Farthing » Wed Apr 18, 2018 3:08 pm

Roger de Coverly wrote:
Wed Apr 18, 2018 1:07 pm
soheil_hooshdaran wrote:
Wed Apr 18, 2018 12:08 pm
What's the basis for assigning numerical values 1-3-5-9 to pieces?
Lost in the mists of time I should imagine.

It seems to work as a broad rule of thumb for a basic evaluation. The earliest writings on chess theory were by Philidor and then later by Staunton. Did these authors propose theories of piece value?
Staunton: The Chess Players Handbook Chapter 4

Code: Select all

Pawn    1.00
Knight  3.05
Bishop  3.50
Rook    5.48
Queen   9.94

soheil_hooshdaran
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Re: Piece values

Post by soheil_hooshdaran » Wed Apr 18, 2018 7:41 pm

"Chess:from beginner to GM" gives it the following way:
1-3-4-8

Francis Fields
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Re: Piece values

Post by Francis Fields » Wed Mar 13, 2019 6:17 pm

There use to be a chess website out there that I can no longer find. Someone had analysed games with material imbalances and calculated the following:

pawn 1.00, knight 3.25, bishop 3.5, rook 5.0, queen 9.75.

I have seen an old chess book that says bishop plus one and a half pawns equals a rook. There is another chess book that says queen is worth 9 or 10 points.
"Politics is the enemy of the people who said that?" Samuel Johnson (the playwright not the architect)

Mark Ashley
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Re: Piece values

Post by Mark Ashley » Fri Mar 22, 2019 8:56 am

I was listening to the perpetual podcast with Matthew Sadler and Natasha Regan as guests which included a discussion about Alpha Zero. It was interesting to hear that AZ wasnt programmed with a numerical value for the pieces, raising the question as to whether or how that affected the way it played the game.

Roger de Coverly
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Re: Piece values

Post by Roger de Coverly » Fri Mar 22, 2019 9:13 am

Mark Ashley wrote:
Fri Mar 22, 2019 8:56 am
It was interesting to hear that AZ wasnt programmed with a numerical value for the pieces, raising the question as to whether or how that affected the way it played the game.
It wasn't programmed with any rules at all. What it came up with is entirely self taught. It doesn't evaluate by notional pawn values either, giving assessments as percentage winning chances.

Actually a human could play with no piece values. You observe that at the start of the game, both sides have eight pawns, one queen, two rooks, two knights, a light squared bishop and a dark squared bishop. Whether or not notional values are assigned, the material is equal until you get unbalanced exchanges, even a bishop for a knight. Material values are just a first approximation to evaluating the relative worth of such exchanges.

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