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- 4...dxc6 5.O-O Qd6 — Exchange, 5...Qd6 (not 6.Na3, 6.d3), C60-C69 1. e4 e5 2. Nf3 Nc6 3. Bb5 Ruy Lopez (Spanish opening), C68 - 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Bxc6 - Ruy Lopez: Exchange Variation, SÉRIE C
Petropolis Interzonal 1973 – Round 6 – Biyiasas, Peter – 1/2-1/2 – Keres, Paul Petrovich – G24

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- 7...Bg7 8.Bd3 O-O 9.O-O, A60-A79 1. d4 Nf6 2. c4 c6 3. d5 e6 Modern Benoni Defense, A70 - 1. d4 Nf6 2. c4 e6 3. Nf3 c5 4. d5 exd5 5. cxd5 d6 6. Nc3 g6 7. e4 - Benoni Defense: Classical Variation, A70 - 1. d4 Nf6 2. c4 e6 3. Nf3 c5 4.... - Benoni Defense, SÉRIE A
Petropolis Interzonal 1973 – Round 6 – Smyslov, Vladimir – 1/2-1/2 – Polugaevsky, Lev – G22

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- 6.Bf4, E20-E59 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 Nimzo-Indian defence, E39 - 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 c5 5. dxc5 O-O - Nimzo-Indian Defense: Classical Variation, Berlin Variation, Pirc Variation, SÉRIE E
Petropolis Interzonal 1973 – Round 7 – Hort, Vlastimil – 0-1 – Ivkov, Borislav – G26

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- 10.Bc2 c5, 11.d4 Qc7 12.Nbd2 Re8, 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, C97 - 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 Na5 - Ruy Lopez: Closed, Chigorin Defense, SÉRIE C
Petropolis Interzonal 1973 – Round 7 – Keres, Paul – 0-1 – Smyslov, Vladimir – G28

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- 5...Bc5 - Polugaevsky Variation, B20 - B99 - 1. e4 c5 - Sicilian Defense, B40 - B49 1. e4 c5 2. Nf3 e6 Sicilian defence, B42 - 1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 a6 5. Bd3 - Sicilian Defense: Kan Variation, Modern Variation, B42 - 1. e4 c5 2. Nf3 e6 3. d4 cxd4 4.... - Sicilian Defense, SÉRIE B 1.e4 2....
Petropolis Interzonal 1973 – Round 8 – Biyiasas, Peter – 1/2-1/2 – Smyslov, Vladimir – G32

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- 5.Bg5 h6 — Main Line, 6.Bxf6 Qxf6 7.e3 Nd7 8.Bd3 (not 8...dxc4), D43 - 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 e6 - Semi-Slav Defense, D43-D49 Queen's Gambit Declined semi-Slav1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 c6, SÉRIE D
Petropolis Interzonal 1973 – Round 8 – Geller, Efim P – 1-0 – Keres, Paul – G29

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- B20 - B99 - 1. e4 c5 - Sicilian Defense, B80-B85 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e6 Sicilian, Scheveningen variation, B87 - 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Bc4 e6 7. Bb3 b5 - Sicilian Defense: Sozin Attack, Flank Variation, B87 - 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4.... - Sicilian Defense, SÉRIE B 1.e4 2....
Petropolis Interzonal 1973 – Round 8 – Gheorghiu, Florin – 0-1 – Polugaevsky, Lev – G31

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