Lifish+HalfKP

Lifish NNUE is a light chess engine derived from Stockfish and the evaluation based on efficiently updateable neural networks.

UCI parameters

Currently, Lifish+HalfKP has the following UCI options:

• Threads

  The number of CPU threads used for searching a position. For best performance, set this equal to the number of CPU cores available.

• Hash

  The size of the hash table in MB.

• MultiPV

  Output the N best lines (principal variations, PVs) when searching. Leave at 1 for best performance.

• Move Overhead

  Assume a time delay of x ms due to network and GUI overheads. This is useful to avoid losses on time in those cases.

• UCI_Chess960

  An option handled by your GUI. If true, Stockfish will play Chess960.

• Use NNUE

  Toggle between the NNUE and classical evaluation functions. If set to "true", the network parameters must be availabe to load from file (see also EvalFile).

• EvalFile

  The name of the file of the NNUE evaluation parameters. Depending on the GUI the filename might have to include the full path to the folder/directory that contains the file.

Compiling Lifish

The MSYS2 environment is recommended for compiling Lifish on Windows.

To compile, type:

make target ARCH=arch [COMP=comp]

Example: make build ARCH=x86-64 COMP=mingw

Lists of supported targets, archs and compilers can be viewed by typing make help.