Why does it take stockfish depth 35 to find mate in 7? - Chess Stack Exchange

My underlying question here is: What is depth? I know depth is supposedly the number of half-moves or plies from the starting position that it has calculated, in at least one line. But I feel this

Why does it take stockfish depth 35 to find mate in 7? - Chess Stack Exchange

engines - Why does Stockfish evaluate this position as equal? - Chess Stack Exchange

engines - Is there a way to use Stockfish to see tactics that aren't necessarily great? - Chess Stack Exchange

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I though this move was genius, stockfish not impressed : r/chessbeginners

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