Depth
Depth is how far the engine searched (in plies). It’s not a guarantee of correctness. Engines search unevenly: forcing lines go deeper.
Evaluation (centipawns)
+0.50 is roughly half a pawn advantage. It’s a heuristic score. Learn trends: if your move drops the eval from +0.8 to -1.2, you blundered.
PV (principal variation)
PV is the current best line the engine expects. It’s useful for learning tactical refutations and defensive resources.
Use the tool
Paste your raw output here: Stockfish Output Explainer
Want the bigger picture? How chess engines work