Sergash: Stein Arild Aarland was 29 years old and rated 2259 at the time of this game, while Magnus was Carlsen was 11 years old and rated 2163.Aarland is a FIDE master, though I am not sure he had his title at the time of this game? On his Chessgames.com profile, it is said that in 1989 he finished 9th at the Cadet World Championship.
<3.Ng1-f3> In a previous game, Carlsen had developed the other knight here: 3.Nb1-c3 Bf8-e7 4.c4xd5 e6xd5 5.Ng1-f3 Ng8-f6 6.Bc1-g5 c7-c6 7.e2-e3 Bc8-e6 8.Bf1-d3 Nb8-d7 9.Qd1-c2 h7-h6 10.Bg5-h4 Ra8-c8 11.0-0 0-0 12.Ra1-b1 Qd8-c7 13.b2-b4 b7-b5 14.a2-a4 a7-a6?! 15.a4-a5! Be6-g4 16.Nf3-d2 Be7-d6 17.Bh4-g3 Rf8-e8 18.Rb1-c1 Re8-e7 19.Nd2-b3 Kg8-h8 20.Nc3-a2 Nd7-b8?! 21.Nb3-c5 Nf6-d7 ± Carlsen vs J L Hammer, 2001, 1-0.
<3...Ng8-f6 4.Nb1-c3> After this move we are transposed in a line previously played by Carlsen.
<4...Bf8-e7 5.Bc1-f4 0-0 6.e2-e3 c7-c5 7.d4xc5 Be7xc5> Aarland plays a more popular move, but not necessarily as good (?), than seen in a previous game, almost a miniature: 4...d5xc4 5.e2-e4 Bf8-b4 6.Bc1-g5 c7-c5 7.Bf1xc4 c5xd4 8.Nf3xd4 Qd8-a5 9.Bc4-b5+ Bc8-d7 10.Bg5-d2? Bd7xb5 11.Nd4xb5 Nf6xe4! 12.Qd1-g4?? Ne4xd2! 13.Qg4xg7 Rh8-f8 14.0-0-0 a7-a6 15.Qg7-e5? a6xb5 16.Nc3-d5? Nb8-d7 17.Qe5-g5? Ra8-c8+ 0-1. Carlsen vs Kulaots, 2002.
<8.Qd1-c2 ⩲> It is possible that 8.a2-a3 ⩲ is better here, as played in the game Steinitz vs Schiffers, 1898, 1-0.
<8...Nb8-c6 9.a2-a3 ⩲> 8...h7-h6!? ⩲ Stockfish 12 - 64 bits POPCNT.
<9...a7-a6? ±> The 2 most played moves here are
A) 9...Qd8-a5 (by far the most played line) 10.Ra1-d1 (threat: b2-b4) Bc5-e7! = / ⩲ as played in the game Euwe vs J Wolpert, 1955, 1-0
But the best seems B) 9...Rf8-e8! 10.0-0-0 e6-e5 (Gyozo Forintos (2395) vs. Anatoli Vaisser (2510), Kotov Memorial 1986 in Tallinn (USSR), 1-0) 11.Bf4-g3 d5-d4 ▢ 12.Nf3xe5 (or 12.Bg3xe5 Nc6xe5 13.Nf3xe5 Re8xe5 transposing) Nc6xe5 13.Bg3xe5 (13.e3xd4 Bc5xd4 14.Nc3-b5 (or 14.Bg3xe5 Re8xe5 transposing) Ne5-c6 ▢ 15.Nb5xd4 ▢ Nc6xd4 ▢ 16.Qc2-c3 ▢ Bc8-f5! 17.Rd1xd4 Re8-e1+ 19.Qc3xe1 Qd8xd4 = or simply 17.Qc3xd4 = Stockfish 12 - 64 bits POPCNT) Re8xe5 14.e3xd4 Bc5xd4 15.Qc2-d3 = Δ Qd3xd4 R Buhmann vs M A Tabatabaei, 2017, draw; also possible is 15.Qc2-d2 = Δ Qd2xd4 Stockfish 12 - 64 bits POPCNT