[haunter]

Here is the same in sjeng used by Apple in the macOS Chess.app https://opensource.apple.com/source/Chess/Chess-410.4.1/sjen...

[mtlmtlmtlmtl]

At a cursory glance, this a good example of a much simpler approach than the Stockfish one. It is far less optimized though. But that's reasonable given the age of that code.