### Cooking Cheese with Texel's tuning method

Posted:

**Fri Jun 16, 2017 8:41 pm**I'm trying to use Texel's tuning method, and I don't understand the results.

Using the same algorithm on the wiki page : https://chessprogramming.wikispaces.com ... ing+Method

I generated 50000 games at 10s+0.1s with Cheese 1.7 vs 1.8, using Adam-Hair-8moves-100133.pgn removing book moves and moves with a high score or mate score, I have 5,5 million positions (46% draw).

I try tuning pieces material values (same value for middle and end game), starting with pawn=100, knight=bishop=325, rook=500, queen=975, and the result after 73 iterations is pawn=94, knight=bishop=325, rook=525, queen=1047.

The problem is bishop and knight value never changed, the values 324 or 326 never reduced the error.

Now if I start with knight=321 and bishop=325 all values are changing and give a different result.

After 143 iterations the result is pawn=99, knight=346, bishop=356, rook=562, queen=1117

Do you think the results are normal ?

How to choose parameters starting values ?

How to choose positions for better results ? (draw rate ? openings ? more positions ? ...)

Using the same algorithm on the wiki page : https://chessprogramming.wikispaces.com ... ing+Method

I generated 50000 games at 10s+0.1s with Cheese 1.7 vs 1.8, using Adam-Hair-8moves-100133.pgn removing book moves and moves with a high score or mate score, I have 5,5 million positions (46% draw).

I try tuning pieces material values (same value for middle and end game), starting with pawn=100, knight=bishop=325, rook=500, queen=975, and the result after 73 iterations is pawn=94, knight=bishop=325, rook=525, queen=1047.

The problem is bishop and knight value never changed, the values 324 or 326 never reduced the error.

Now if I start with knight=321 and bishop=325 all values are changing and give a different result.

After 143 iterations the result is pawn=99, knight=346, bishop=356, rook=562, queen=1117

Do you think the results are normal ?

How to choose parameters starting values ?

How to choose positions for better results ? (draw rate ? openings ? more positions ? ...)