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IM Andrew Martin on the mainline King's Indian; Korchnoi's 9 a4!? : 1 d4 Nf6 2 c4 g6 3 Nc3 Bg7 4 e4 d6 5 Nf3 0-0 6 Be2 e5 7 0-0 Nc6 8 d5 Ne7 9 a4!?
