Boris Spassky lost this game — and the engine says it slipped away on move 40 (Kh8). They think you'd have lost it too. Take the board at that exact moment and prove them wrong.
On move 40, Black played Kh8, cornering the king in the worst possible square when Rb7 kept practical resistance alive. The move surrendered all escape routes and allowed Fischer's coordinated pieces to deliver the final blow—a catastrophic swing of 3000 centipawns in one ply.
Done gloating? Your own games have moments like this too — we'll find them.
Analysis by Stockfish; commentary AI-written from the engine's findings. BetterChess is a practice tool — no rating guarantees, only fewer blunders.