Kasparov – Karpov1990
Nobody at the top had taken the Scotch seriously for a century until Kasparov played it in this match; game fourteen was drawn and this, game sixteen, was won in a hundred and two moves. The Mieses line — the repertoire's — with the doubled c-pawns, the pawn on e5, and a rook that gets to c7. The ending is long, and the opening is why it was winnable.
Inside your repertoire until move 8