Knight Outpost at d5

Boleslavsky gives up a pawn in this game to establish a knight at d5 so that it can not be driven away. After this, he then begins an attack with his king-side pawns, and with the help of some tactics, finishes his opponent off.

(notes & title by irving chernev)

Wisegi is correct! 1 Nc6 is the key move!