15...e4!? fxe4, 16..f4 push 20...Be5 blockade Gheorghiu vs Kasparov, 1988  (E88) King's Indian, Samisch, Orthodox, 7.d5 c6, 36 moves, 0-1 19. e5! dxe5 20. f5! against fianchettoed king bishop J Penrose vs Tal, 1960  (A65) Benoni, 6.e4, 39 moves, 1-0 13... c5! pawn sac for open c and a files. 14..Na5 Lautier vs Ivanchuk, 1991  (D91) Grunfeld, 5.Bg5, 25 moves, 0-1 3 games