Sac the knight, salvage the draw - an epic battle

An epic in which I commit several positional errors early on, saddling myself with weak isolated pawns while my opponent centralises a pair of powerful knights and leaves his dark squared bishop menacingly on the long diagonal, which then breaks down into a R+N endgame, with me down a pawn. I try to set several traps, and eventually a lapse of concentration from my opponent, plus a nice little tactical shot in my favour, leaves the game in a draw.