Y Vasilchuk vs Korchnoi, 1947  (B74) Sicilian, Dragon, Classical, 60 moves, 0-1 S Khavsky vs Korchnoi, 1950  (B21) Sicilian, 2.f4 and 2.d4, 31 moves, 0-1 G Kasparian vs Korchnoi, 1952  (C49) Four Knights, 44 moves, 0-1 E Lazarev vs Korchnoi, 1953  (A07) King's Indian Attack, 40 moves, 0-1 4 games