subtle opening mistakes by Korchnoi but later Tal slips 19... Qxe6 would give white a miserable game(notice the buried bishop at b2)
Korchnoi vs Tal, 1968 (E50) Nimzo-Indian, 4.e3 O-O 5.Nf3, without ...d5, 59 moves, 1-0
1 game
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