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- 5...Nf6 6.Nc3 d6, 7.Be2 Nxd4 8.Qxd4 Bg7 9.Be3 O-O 10.Qd2 (not 10...Be6), B20 - B99 - 1. e4 c5 - Sicilian Defense, B30 - B39 1.e4 c5 2. Nf3 Nc6 Sicilian defence, B36 - 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 g6 5. c4 - Sicilian Defense: Accelerated Dragon, Maróczy Bind, B36 - 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4.... - Sicilian Defense, SÉRIE B 1.e4 2....
Petropolis Interzonal 1973 – Round 3 – Hort, Vlastimil – 1/2-1/2 – Mecking, Henrique – G9

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- 7.Be3 Ng4 — Main Line, 8.Bg5 f6 9.Bh4 Nc6 — Main Line, E60-E99 1. d4 Nf6 2. c4 g6 King's Indian defence, E92 - 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 e5 - King's Indian Defense: Orthodox Variation, SÉRIE E
Petropolis Interzonal 1973 – Round 3 – Portisch, Lajos – 1/2-1/2 – Geller, Efim P – G11

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- 6.Nc3 Ne4, 7.Bd2 Bf6, E12-E19 1. d4 Nf6 2. c4 e6 3. Nf3 b6 Queen's Indian defence, E17 - 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Be7 - Queen's Indian Defense: Traditional Variation, SÉRIE E
Petropolis Interzonal 1973 – Round 3 – Reshevsky, Samuel – 1/2-1/2 – Smyslov, Vladimir – G13

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- 10.d5 e5, 9.e4 c5 — Main Line, D43-D49 Queen's Gambit Declined semi-Slav1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 c6, D48 - 1. d4 d5 2. c4 c6 3. Nc3 Nf6 4. e3 e6 5. Nf3 Nbd7 6. Bd3 dxc4 7. Bxc4 b5 8. Bd3 a6 - Semi-Slav Defense: Meran Variation, SÉRIE D
Petropolis Interzonal 1973 – Round 4 – Polugaevsky, Lev – 1-0 – Biyiasas, Peter – G16

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- 7...c6 8.b3 b6, 9.Rd1 Bb7 10.Nc3 Rc8 11.e4 dxe4, E01-E09 1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 Catalan, closed, E08 - 1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 Be7 5. Nf3 O-O 6. O-O Nbd7 7. Qc2 - Catalan Opening: Closed, SÉRIE E
Petropolis Interzonal 1973 – Round 5 – Polugaevsky, Lev – 1-0 – Keres, Paul – G20

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- C90-C99 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 O-O 8. c3 d6 Ruy Lopez, closed, C93 - 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 d6 8. c3 O-O 9. h3 h6 - Ruy Lopez: Closed, Smyslov Defense, SÉRIE C
Petropolis Interzonal 1973 – Round 5 – Savon, Vladimir – 1/2-1/2 – Geller, Efim P – G21

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