This engine violates the license (GPL v3)
no source code attached.

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HypnoS
1a : g2g4
1b : e2e4 ponder c7c5

My opinion is that it would be necessary to clarify the classifications.
The difference between clone and derivative is abysmal.
So in this Thread most likely we are talking about Derivatives but wrongly defined as Clones.

This has value between Stockfish Source Code -> Modified Code (Derived) A ...

@AlexChess
Alessandro please remove my name from the authors list of your engines thanks.

Eduard..
std::cout << "OptimalTime " << SE::tmOptTime << sync_endl;

This line prints the value of "tmOptTime" using std::cout.
OptimalTime is just the reference to the variable and could be named anything else.

SE namespace = Stockfish::Eval;: This line creates an SE alias for the Stockfish ...

@SedatChess
You have a PM on OCF, it seems it is not possible to send them here.

Greetings

M.Z