Cheese 2.0

[Patrice Duhamel]

Cheese 2.0 is available :

http://cheesechess.free.fr/en/download.html

Changes :

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- add multi processor support (YBWC)
- new opening book format
- add contempt factor
- add benchmark option
- add personality option
- add a parameter to reduce engine speed
- add Late Move Pruning
- remove bonus for queen on 7th rank
- change parameters for mobility
- change bonus for pawns and rooks

1CPU, 10s+0.1s :

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Rank Name                 Elo    +    - games score oppo. draws 
1    Cheese 2.0            23    4    4 10000   57%   -23   39% 
2    Cheese 1.92          -23    4    4 10000   43%    23   39% 

1CPU vs 4CPU, 10s+0.1s :

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Rank Name                 Elo    +    - games score oppo. draws 
1    Cheese 2.0 4CPU      103    8    8  2000   79%  -103   30% 
2    Cheese 1.92         -103    8    8  2000   21%   103   30% 

Cheese can use 64 threads, but there is no gain with more than 8 threads.
I'm using almost the same implementation of YBWC as Stockfish 6 (without late join), I will try to look at other methods later.

There is an option to use a personality, defined in a .txt file, look at README.txt and personality/default.txt for more details.
I could add more parameters in the next versions.

I didn't use tuning results, Texel's tuning method seems to work with few parameters but other parameters like PST or mobility give bad results.

Happy end of year celebrations.

[Graham Banks]

Thanks Patrice.
Next time I run an 8CPU Swiss, I'll include it.

[Sergio Martinez]

Thank you Patrice!

[CMCanavessi]

Nice! Thanx for the new version!

[Modern Times]

+45 Elo on 1 core on CCRL 40/40 so far:

http://www.computerchess.org.uk/ccrl/40 ... +opponents

[Damir]

Thanks Patrice.
Next time I run an 8CPU Swiss, I'll include it.

Hi Graham

Remember to run it as Swiss Cheese.

[Graham Banks]

Thanks Patrice.
Next time I run an 8CPU Swiss, I'll include it.

Hi Graham

Remember to run it as Swiss Cheese.