Karpov–Csom 1977 — Attack from a Lost Position
Objective: White to move. Task goal: find the winning combination and convert the attack into checkmate.
Position and task condition
White is down material and only moments earlier the position was lost. Black's knight has just returned to f8 and everything appears to be under control. Karpov found one move that completely turns the game around. Find the idea and calculate Black's possible replies.
FEN
q3rn1k/2QR4/pp2pp2/8/P1P5/1P4N1/6n1/6K1 w - - 0 1Anatoly Karpov – Istvan Csom · 1977 · Bad Lauterberg, 1977