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Magnus Carlsen vs Michael Rosbach
Nordic Youth Ch Group E (2001), Laugar ISL, rd 5, Feb-18
Spanish Game: Cozio Defense. General (C60)  ·  1/2-1/2

ANALYSIS [x]

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Kibitzer's Corner
Aug-27-20  Sergash: Michael Rosbach was born in Denmark in 1990, the same year than Carlsen, so they both were 10 or 11 years old.

<1.e2-e4 e7-e5 2.Ng1-f3 Nb8-c6 3.Bf1-b5 Ng8-e7> This is the Ruy Lopez - Cozio Defense, rarely played but perfectly playable.

<8...d7-d6?!> This is inferior to 8...e5xd4! 9.c3xd4 0-0 10.Nb1-c3 d7-d6 (NOW is a good time to play this move!) 11.h2-h3 Nc6-a5 12.Bb3-c2 c7-c5 = Amador Rodriguez Cespedes (2505) vs. Nestor Velez (2385), Memorial Capablanca (Cuba) 1985, section A, round 2, draw.

<9.h2-h3?! 0-0 10.Bc1-e3 Bc8-b7 ⩲> Probably played without much thinking, to prevent Bc8-g4, a move often seen in the Ruy Lopez. Better is 9.a2-a4 b5xa4 (or 9...Bc8-b7 10.d4xe5! (Denis Verduga Zavala (2300) vs. Arthur Bisguier (2440), Lone Pine Open (USA) 1977, round 1, 1-0) Nc6xe5! 11.Nf3xe5! d6xe5 ± Komodo 9.2 64 bits) 10.Bb3xa4 0-0 ± J. Gonzalez Cabillon vs. A. Ortiz, Uruguay Team Championship 1988, 1-0.

<11.Nb1-d2> This appears to be a novelty by Carlsen. Before that, the only move played was 11.Qd1-c1, as seen in the game Konstantinos Prentos (2241) vs. Georgios Theodorakopoulos (2111), 29th Greece Team Championship 2000, round 4, 1-0. Carlsen's moves seems to be an improvement, but 11.d4xe5! ⩲ could even be better according to Komodo 9.2 64 bits.

<11...d6-d5? 12.e4xd5> 11...e5xd4! 12.c3xd4 Nc6-a5 = Komodo 9.2 64 bits.

<12...Ne7xd5 13.Be3-g5! ±> 12...Nc6-a5! 13.d4xe5 Ne7xd5 14.Be3-g5! Qd8-c8 ± Komodo 9.2 64 bits.

<13...Qd8-d7 14.Nd2-e4! Nd5-b6 15.Ne4-c5 Qd7-c8 ±> 13...Nc6-e7! 14.Nd2-e4! h7-h6! 15.Bb3xd5! Bb7xd5 16.Ne4-f6+ ▢ Bg7xf6! 17.Bg5xf6 e5-e4 18.Nf3-e5 ± Komodo 9.2 64 bits.

<16.Nc5xb7? Qc8xb7 17.d4xe5 Nc6xe5! 18.Nf3xe5 Bg7xe5 19.Rf1-e1 ⩲> Magnus lost his way... The bishop on b7 cannot avoid to be exchanged, while the white knight on c5 is superbly placed. 16.d4xe5! Nc6xe5 17.Nf3xe5 Bg7xe5 18.Rf1-e1! Be5-h8! 19.Qd1-d2! ± / +- Komodo 9.2 64 bits.

<19...Be5-g7?! 20.Re1-e7! ±> Why not put a new piece in play? 19...Ra8-e8 ⩲ Komodo 9.2 64 bits.

Aug-27-20  Sergash: <20...Ra8-d8?> 20...Qb7-c6 ± Komodo 9.2 64 bits.

<21.Qd1-g4?> Here Carlsen missed a nice tactics: 21.Bb3xf7+!! and now

A) White mates in 10 moves if 21...Rf8xf7 22.Qd1xd8+ Rf7-f8 23.Re7xg7+! Kg8xg7 24.Bg5-h6+! Kg7xh6 25.Qd8xf8+ Kh6-g5 (or 25...Kh6-h5 26.g2-g4+ Kh5-g5 (or 26...Kh5-h4 27.Qf8-h6#) 27.f2-f4+ Kg5-h4 transposing) 26.f2-f4+! Kg5-h5 27.g2-g4+ Kh5-h4 28.Kg1-h2! and mate 3 moves later. Komodo 9.2 64 bits;

B) 21...Kg8-h8 22.Qd1-g4 +- or 22.Qd1-e2 +- Komodo 9.2 64 bits.

<21...Qb7-c8?!> 21...Nb6-d5 22.Qg4-f3 Qb7-a8 23.Re7-e1 Nd5-f6 ± Komodo 9.2 64 bits.

<22.Qg4-f3> Better is 22.Qg4-e4! Nb6-c4 (or 22...Qc8-a8 23.Qe4xa8 Rd8xa8 24.Re7xc7 ± with the bishop pair and a pawn... Komodo 9.2 64 bits) 23.Bb3xc4 b5xc4 24.Ra1-e1 ± Komodo 9.2 64 bits.

<22...Rd8-d7??> This is becoming tough to watch this game! The only move is 22...Nb6-c4 ▢ 23.Re7-e2 Rd8-d7 24.Bb3xc4 b5xc4 25.Qf3-c6 ± Komodo 9.2 64 bits.

<23.Ra1-e1?> 23.Bf3xf7+! Kg8-h8 (not 23...Rf8xf7? 24.Qf3xf7+Kg8-h8 25.Qf7xg7#) 24.Ra1-e1! Rd7xe7 25.Bg5xe7 Qc8-a8 26.Re1-e4! (a human player might prefer 26.Be7xf8 Qa8xf3 27.Bf8xg7+ Kh8xg7 28.g2xf3 Kg7xf7 +- ) Rf8-b8 27.Qf3-d3 +- Komodo 9.2 64 bits.

<23...Rd7xe7? 24.Bg5xe7 +-> Now White is winning again. 23...Nb6-c4 ▢ ± Komodo 9.2 64 bits.

<24...Qc8-e8 25.Re1-e4! +-> Better is 24...Qc8-d7 +- Komodo 9.2 64 bits.

<25...Nb6-c4?! 26.Be7xf8 Qe8xf8 27.Bb4xc4 b5xc4 +-> Now the timing for this move is bad. The lesser evil goes like this: 25...Qe8-d7 26.Be7xf8 Bg7xf8! 27.Re4-f4! Nb6-c4 28.Bb3xc4 b5xc4 +- Komodo 9.2 64 bits.

<28.Re4xc4> Stronger is 28.Qf3-e2! Qf8-c5 (or 28...Qf8-d6 29.Re4-e8+! Bg7-f8 30.Qe2xc4 +- Komodo 9.2 64 bits) 29.Qe2xc4 Qc5-d6 30.Re4-e8+! Bg7-f8 31.Qc4-d4! +- Komodo 9.2 64 bits.

<28...Qf8-b8> Better is 28...Qf8-d8 Komodo 9.2 64 bits.

Aug-27-20  Sergash: <29.Rc4-b4 Qb8-d8 30.g2-g3 +-> 29.Qf3-f4! Qb8-e8 30.g2-g3! +- Komodo 9.2 64 bits.

<30...Qd8-d7?! 31.Rb4-b8+ Bg7-f8 32.Qf3-a8! Qd7-d6 +-> 30...Bg7-e5 would give some space to the black king...

<33.Qa8-b7 Kg8-g7> Better is 33.Rb8-d8 +- Komodo 9.2 64 bits. Also enough for the win is 33.Rb8xf8+ Qd6xf8 34.Qa8xa6 +- Komodo 9.2 64 bits, even if enough would also be 34.Qa8xf8+ Kg8xf8 +-

<34.Rb8-a8 Qd6-e5 +-> Better is 34.Rb8-c8. Komodo 9.2 64 bits.

<35.Qb7xa6?? Bf8-c5! ±> A huge mistake that let the win slips away... 35.Ra8xa6 Qe5-e2 36.Ra6-a5! +- to control c5. Komodo 9.2 64 bits.

<36.Kg1-f1? Qe5-f5! => The double threat on f2 and h3 gives Black a draw...

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