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- 2.Nf3 Nf6, A10-A39 English Opening, A30a - Symmetrical, A30y - 2.Nf3 Nf6 3.g3 b6 4.Bg2 Bb7 5.O-O e6 6.Nc3 Be7 7.d4 cxd4 8.Qxd4 d6 9.Rd1 a6 10.b3 Nbd7 11.e4 Qc7 - Symmetrical Hedgehog Flexible Formation, SÉRIE A
4. M-Tel Masters 2008 – Round 8 – Bu, Xiangzhi – 1/2-1/2 – Ivanchuk, Vasyl – G23

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- 2.Nf3 Nf6, A10-A39 English Opening, A30a - Symmetrical, A30y - 2.Nf3 Nf6 3.g3 b6 4.Bg2 Bb7 5.O-O e6 6.Nc3 Be7 7.d4 cxd4 8.Qxd4 d6 9.Rd1 a6 10.b3 Nbd7 11.e4 Qc7 - Symmetrical Hedgehog Flexible Formation, SÉRIE A
Biel Interzonal 1985 – Round 9 – Gutman, Lev – 1/2-1/2 – Ljubojevic, Ljubomir – G28

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- 2.Nf3 Nf6, A10-A39 English Opening, A30a - Symmetrical, A30y - 2.Nf3 Nf6 3.g3 b6 4.Bg2 Bb7 5.O-O e6 6.Nc3 Be7 7.d4 cxd4 8.Qxd4 d6 9.Rd1 a6 10.b3 Nbd7 11.e4 Qc7 - Symmetrical Hedgehog Flexible Formation, SÉRIE A
Dos Hermanas 1997 – Round 8 – Kramnik, Vladimir – 1/2-1/2 – Shirov, Alexei – G31

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- 2.Nf3 Nf6, A10-A39 English Opening, A30a - Symmetrical, A30y - 2.Nf3 Nf6 3.g3 b6 4.Bg2 Bb7 5.O-O e6 6.Nc3 Be7 7.d4 cxd4 8.Qxd4 d6 9.Rd1 a6 10.b3 Nbd7 11.e4 Qc7 - Symmetrical Hedgehog Flexible Formation, SÉRIE A
Karen Asrian Memorial 2008 – Round 9 – Bu, Xiangzhi – 1-0 – Adams, Michael – G23

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- 2.Nf3 Nf6, A10-A39 English Opening, A30a - Symmetrical, A30y - 2.Nf3 Nf6 3.g3 b6 4.Bg2 Bb7 5.O-O e6 6.Nc3 Be7 7.d4 cxd4 8.Qxd4 d6 9.Rd1 a6 10.b3 Nbd7 11.e4 Qc7 - Symmetrical Hedgehog Flexible Formation, SÉRIE A
Luzern olm 1982 – Round 13 – Seirawan, Yasser – 1/2-1/2 – Gruenfeld, Yehuda – G57

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- 2.Nf3 Nf6, A10-A39 English Opening, A30a - Symmetrical, A30y - 2.Nf3 Nf6 3.g3 b6 4.Bg2 Bb7 5.O-O e6 6.Nc3 Be7 7.d4 cxd4 8.Qxd4 d6 9.Rd1 a6 10.b3 Nbd7 11.e4 Qc7 - Symmetrical Hedgehog Flexible Formation, SÉRIE A
Luzern olm 1982 – Round 5.3 – Polugaevsky, Lev – 0-1 – Ftacnik, Lubomir – G24

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- 2.Nf3 Nf6, A10-A39 English Opening, A30a - Symmetrical, A30y - 2.Nf3 Nf6 3.g3 b6 4.Bg2 Bb7 5.O-O e6 6.Nc3 Be7 7.d4 cxd4 8.Qxd4 d6 9.Rd1 a6 10.b3 Nbd7 11.e4 Qc7 - Symmetrical Hedgehog Flexible Formation, SÉRIE A
Mar del Plata 1982 – Round 1 – Giardelli, Sergio C. – 1/2-1/2 – Portisch, Lajos – G5

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- 2.Nf3 Nf6, A10-A39 English Opening, A30a - Symmetrical, A30y - 2.Nf3 Nf6 3.g3 b6 4.Bg2 Bb7 5.O-O e6 6.Nc3 Be7 7.d4 cxd4 8.Qxd4 d6 9.Rd1 a6 10.b3 Nbd7 11.e4 Qc7 - Symmetrical Hedgehog Flexible Formation, SÉRIE A
Mar del Plata 1982 – Round 1 – Polugaevsky, Lev – 0-1 – Portisch, Lajos – G52

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- 2.Nf3 Nf6, A10-A39 English Opening, A30a - Symmetrical, A30y - 2.Nf3 Nf6 3.g3 b6 4.Bg2 Bb7 5.O-O e6 6.Nc3 Be7 7.d4 cxd4 8.Qxd4 d6 9.Rd1 a6 10.b3 Nbd7 11.e4 Qc7 - Symmetrical Hedgehog Flexible Formation, SÉRIE A
Mar del Plata 1982 – Round 1 – Seirawan, Yasser – 1-0 – Polugaevsky, Lev – G51

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- 2.Nf3 Nf6, A10-A39 English Opening, A30a - Symmetrical, A30y - 2.Nf3 Nf6 3.g3 b6 4.Bg2 Bb7 5.O-O e6 6.Nc3 Be7 7.d4 cxd4 8.Qxd4 d6 9.Rd1 a6 10.b3 Nbd7 11.e4 Qc7 - Symmetrical Hedgehog Flexible Formation, SÉRIE A
Mar del Plata 1982 – Round 1 – Seirawan, Yasser – 1-0 – Polugaevsky, Lev – G6

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- 2.Nf3 Nf6, A10-A39 English Opening, A30a - Symmetrical, A30y - 2.Nf3 Nf6 3.g3 b6 4.Bg2 Bb7 5.O-O e6 6.Nc3 Be7 7.d4 cxd4 8.Qxd4 d6 9.Rd1 a6 10.b3 Nbd7 11.e4 Qc7 - Symmetrical Hedgehog Flexible Formation, SÉRIE A
Milaan 1975 – Round 10 – Petrosian, Tigran V – 1/2-1/2 – Andersson, Ulf 1949 – G35

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