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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Chess Engines: Houdini vs Stockfish notable engine vs engine game - TCEC Season 8 Stage 3 2015

Stockfish - Chess Engines

Stockfish - Chess Engines

Stockfish, Houdini Battle For Computer Chess Championship; Komodo vs Lc0 For 3rd

Houdini 6 vs Stockfish 9. The Wildest & Most Complex Chess Engine Game So Far

Chess Engines: Houdini vs Stockfish notable engine vs engine game - TCEC Season 8 Stage 3 2015

Would a computer chess engine such as Stockfish be effective at chess variations with different starting positions (such as Fischer 360) without significant changes to the code? - Quora

World's Best Chess Engines TCEC16 Houdini 5 vs Stockfish 8 SuperfinalGame 18