engines - Is Houdini 6 a Stockfish clone? - Chess Stack Exchange

I've been hearing this claim being bandied about quite a lot and I'm wondering if there's any substance to it. Apparently the details are in a certain thread on Talkchess, but it's not viewable to

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engines - Is Houdini 6 a Stockfish clone? - Chess Stack Exchange

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engines - Is Houdini 6 a Stockfish clone? - Chess Stack Exchange