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- 4...Bb7 5.Bd3 c5, 6.O-O Be7 7.b3 O-O 8.Bb2 cxd4 9.exd4 d5, E12-E19 1. d4 Nf6 2. c4 e6 3. Nf3 b6 Queen's Indian defence, E14 - 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. e3 - Queen's Indian Defense: Spassky System, SÉRIE E
Buenos Aires olm 1978 – Round 1 – Petrosian, Tigran A. – 1-0 – Browne, Walter S – G16

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- 9...Re8 10.Be3 (not 10...exd4), E60-E99 1. d4 Nf6 2. c4 g6 King's Indian defence, E69 - 1. d4 Nf6 2. c4 g6 3. Nf3 Bg7 4. g3 O-O 5. Bg2 d6 6. O-O Nbd7 7. Nc3 e5 8. e4 c6 9. h3 - King's Indian Defense: Fianchetto Variation, Classical Main Line, SÉRIE E
Buenos Aires olm 1978 – Round 1 – Petrosian, Tigran A. – 1-0 – Ciocaltea, Victor – G10

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- 4...Bg4 5.Bxc4 e6 — Janowski, 6.h3 Bh5 7.Nc3 a6 8.g4, D20-D29 1. d4 d5 2. c4 dxc4 Queen's gambit accepted, D25 - 1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 - Queen's Gambit Accepted: Normal Variation, SÉRIE D
Buenos Aires olm 1978 – Round 1 – Petrosian, Tigran A. – 1/2-1/2 – Dzindzichashvili, Roman – G8

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- A60-A79 1. d4 Nf6 2. c4 c6 3. d5 e6 Modern Benoni Defense, A73 - 1. d4 Nf6 2. c4 c5 3. d5 e6 4. Nc3 exd5 5. cxd5 d6 6. e4 g6 7. Nf3 Bg7 8. Be2 O-O 9. O-O - Benoni Defense: Classical Variation, Main Line, A73 - 1. d4 Nf6 2. c4 c5 3. d5 e6 4.... - Benoni Defense, SÉRIE A
Buenos Aires olm 1978 – Round 1 – Polugaevsky, Lev – 1-0 – Acuna Vilela, Jose Alberto – G1

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- A10-A39 English Opening, A28 - 1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. d3 - English Opening: King's English Variation, Four Knights Variation, Flexible Line, A28 - 1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4.... - English Opening, SÉRIE A
Buenos Aires olm 1978 – Round 1 – Ribli, Zoltan – 1/2-1/2 – Petrosian, Tigran A. – G4

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- A80-A99 1. d4 f5 Dutch, A93 - 1. d4 f5 2. c4 Nf6 3. g3 e6 4. Bg2 Be7 5. Nf3 O-O 6. O-O d5 7. b3 - Dutch Defense: Stonewall Variation, Botvinnik Variation, A93 - 1. d4 f5 2. c4 Nf6 3. g3 e6 4.... - Dutch Defense, SÉRIE A
Buenos Aires olm 1978 – Round 1 – Schmidt, Waldemar – 1/2-1/2 – Spassky, Boris V. – G28

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