fishutils

Auto-apply parameter tweaks to Stockfish or multi-variant Stockfish.

Usage

Run python3 fishutils.py -h to get info on required and optional arguments. See the Wiki for a simple example on how to use the script.

The main functionality of the script is to automatically apply SPSA tuning results from fishtest or multi-variant fishtest to your Stockfish repository. To do this, copy the results of a SPSA tuning session to a file and run python3 fishutils.py -s /path/to/stockfish/src/ -i /path/to/tuning_results.txt, or copy the the tuning results to the clipboard and run python3 fishutils.py -s /path/to/stockfish/src/ and then insert them.

An input line for the script (taken from fishtest tuning results) can, e.g., look like: param: mLever[4], best: 27.00, start: 17.00, min: -100.00, max: 200.00, c 41.714131, a 223.069148. The script then changes the value in the source code according to the given input line, in this example changing the middlegame value of Lever[4] from 17 to 27.

Features

• Types int, Value, and Score are supported.
• Enums are replaced by their values when used as an array index, e.g., [PAWN] -> [1].
• If a variable is defined by an enum, the tuning results are applied to the defining enum instead of the variable itself, e.g., PieceValue[MG][1] -> PawnValueMg.
• The functions round, floor, and ceil are supported for rounding the best/new value.
• The -d/--dry-run option can be used to view the changes wihout applying them to files.
• Replacing values might lead to misaligned lines of array definitions. These can be realigned by running the script with the option -m align afterwards.

Limitations

The script does not parse C++ code, but only searches for regular expression patterns. Therefore, it might fail to apply tuning results due to:

• comments
• preprocessor directives
• namespaces
• conflicting names/definitions