You don't have a search and you want to write an eval ?

Thanks lucasart for your proposed steps to write a chess program.
What I meant is your step2.
I've written a very basic material count evaluation function based on these articles:
https://chessprogramming.wikispaces.com/Evaluation
https ...

OK, many thanks again H.G.Muller for ur very interesting advises.
In fact I'm a very beginner in chess programing. Ur ideas will help me very much.
Thanks

Many thanks H.G.Muller for ur reply.
Yes, I've just a 1-ply search and I need an evaluation function to choose the best move.
I'm programming just for fun and I don't want a strong program just a simple one which will be, perhaps, a starting point for another person.
I'll take a look at the links u ...

Thanks BrianR for the link.
Of course, I've already visited this page. What I need is a simple practical example, even in pseudo code, which can play acceptable moves.

Hi,
Inspired by SARGON I'm trying to write a simple chess program.
For the moment the program (DOS terminal) plays random legal simple moves (No castling, en passant, promotion, 50 rule....).
I need ur help please to add the simplest possible evaluation function to choose the best move among ...