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- 4...O-O 5.a3 Bxc3+, 6.Qxc3 b6 7.Bg5 (not 7...Ba6, 7...Bb7), E20-E59 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 Nimzo-Indian defence, E32 - 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 - Nimzo-Indian Defense: Classical Variation, SÉRIE E
World Cup 1989 – Round 1 – Seirawan, Yasser – 1-0 – Hjartarson, Johann – G28
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- 6.e4 Nxc3 — Main Line, 7.bxc3 cxd4 8.cxd4 Bb4+ 9.Bd2 Bxd2+ 10.Qxd2 O-O 11.Bc4 Nc6 12.O-O (not 12...b6), D40-D42 – 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 c5 – Queen’s Gambit Declined: Semi-Tarrasch Defense, D41 - 1. c4 c5 2. Nf3 Nf6 3. Nc3 Nc6 4. g3 d5 5. d4 e6 - Queen's Gambit Declined: Semi-Tarrasch Defense, SÉRIE D
World Cup 1989 – Round 1 – Seirawan, Yasser – 1-0 – Korchnoi, Viktor – G23
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- 7.e3 e6 — Exchange, 8.Qb3 Bb4 - Trifunovic Variation, D10-D19 1. d4 d5 2. c4 c6 Queen's Gambit Slav defence, D14 - 1. d4 d5 2. c4 c6 3. cxd5 cxd5 4. Nc3 Nf6 5. Nf3 Nc6 6. Bf4 Bf5 - Slav Defense: Exchange Variation, Symmetrical Line, SÉRIE D
World Cup 1989 – Round 1 – Seirawan, Yasser – 1-0 – Nogueiras Santiago, Jesus – G12
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- 4.e4 dxe4, 5.Nxe4 (not 5...Nf6), D30-D39 1. d4 d5 2. c4 e6 Queen's gambit declined, D31 - 1. d4 d5 2. c4 e6 3. Nc3 - Queen's Gambit Declined: Queen's Knight Variation, D31 - 1. d4 d5 2. c4 e6 3. Nc3 Be7 - Queen's Gambit Declined: Charousek Variation, SÉRIE D
World Cup 1989 – Round 1 – Seirawan, Yasser – 1/2-1/2 – Ribli, Zoltan – G16
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- 10.d5 c4 11.dxe6 fxe6 12.Bc2 Qc7 13.O-O, 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
World Cup 1989 – Round 1 – Seirawan, Yasser – 1/2-1/2 – Ribli, Zoltan – G19
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