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Stockfish NNUE 2020-06-22

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NNUE = efficiently updateable neural network backwards.

 Changes:
Removed k-p_256x2-32-32 from the binary package.
Added eval_nnue command. Thank you, tttak!
Added a linker option to strip the binaries.
Replaced the nn parameter file for halfkp_256x2-32-32.

The nn parameter file was generated with the following commands.

 Stockfish NNUE 2020-06-22 download


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