Fire 8 has been partially tuned by hand, and partially with

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CLOP

https://www.remi-coulom.fr/CLOP/

by Rémi Coulom

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and 

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Texel tuning method
https://www.chessprogramming.org/Texel%27s_Tuning_Method

by Peter Österlund

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like bench and perft, tuning results are automatically saved to a time-stamped filed

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