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 can Stockfish give different evaluations at the same depth? - Quora

Stockfish 10 cant find mate in 2? : r/chess

Stockfish fails to solve this puzzle on depth 25. White to move and win : r/ chess

Stockfish fails to solve this puzzle on depth 25. White to move and win : r/ chess

How come Stockfish predicts mate in 26-24 moves, I make a different move that seems more logical to me, and it jumps down to mate in 14 moves (I'm not claiming to

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

Why can Stockfish give different evaluations at the same depth? - Quora

Games – Campfire Chess

I composed a puzzle stockfish can't solve. (Black to play, mate in 11) : r/ chess