Selezniev vs Alekhine , Triberg 1921
Alexander Alekhine played this game when he was a 29 years old and at his peak. I've reviewed this game several times.
A classic example of changing goals and adapting to conditions on the board including a nice instructive endgame highlighting the strength of connected passed pawns after the final minor piece is exchanged off in an effort to prevent the promotion of a pawn. Alekhine at his best :)