What is “stockfish” Package?

Strong open-source chess engine
For more details: https://stockfishchess.org/

Installation

• Open Terminal by pressing command+space then type terminal and hit Enter key.
• Install homebrew first.

  ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)" < /dev/null 2> /dev/null

• Install stockfish.

  brew install stockfish

Now, use stockfish!