[ 18...h8-g7? 19.d4-c5! ( 19.b2-c3? e7-d6 20.d4-e5 b8-c7 21.g3-h4 f8-e7 22.h4-g5 e7-f6 23.g5xc5 c7-d6 24.c5xe7 d8xb2 25.f4-e5 b2-a1 26.e5-d6 a5-b4 27.d6-c7 a1-d4 ) 19...a5-b4 20.c5-b6 b8-c7 ( 20...b8-a7 21.g3-h4 a7xc5 22.e3-d4 ) 21.b6-a7 c7-b6 22.a7xc5 b4xd6 23.b2-c3 g7-f6 24.c3-d4! d8-c7 25.e1-f2! f8-g7 26.g3-h4 g7-h6 27.c1-b2 a3xc1 28.d4-c5 d6xb4 29.e3-d4 c1xg5 30.d4-e5 f6xd4 31.h4xe5 ]

[ 18...e7-d6? 19.d4-e5 b8-c7 20.e5-f6 d6-c5 21.f4-e5! 21...c7-b6 22.g3-f4 f8-g7 ( 22...d8-c7 23.f6-e7 f8xd6 24.e5-f6 ) 23.f4-g5 g7-h6 24.e3-f4 d8-c7 25.e1-f2! a5-b4 ( 25...c7-d6! 26.e5xc7 b6xd8 27.b2-c3 a5-b4 28.c3xa5 c5-d4 ) 26.f2-e3 b6-a5 27.f6-e7 c5-d4 28.e5xc3 b4xd2 29.b2-c3 d2xb4 30.e3-d4 c7-d6 31.e7xc5 b4xd6 32.g5-f6 ]

[ 18...d8-c7 19.d4-e5 ( 19.b2-c3 ) 19...h8-g7 20.e1-d2 ( 20.g3-h4? e7-f6 21.e3-d4 b8-a7! 22.e1-d2 f8-e7 23.f4-g5 c7-b6 24.b2-c3 b6-c5 25.d4xb6 f6xb2 ) 20...c7-b6 21.g3-h4 e7-f6 22.e3-d4 b6-c5 23.d4xb6 a5xc7 24.d2-c3 f6xd4 25.c3xe5 c7-d6 26.e5xc7 b8xd6 27.b2-c3 g7-f6 28.c3-d4 f8-g7 ]

[ 19.b2-c3 c7-b6 ( 19...h8-g7 20.c3-b4 ; 19...c7-d6 20.d4-e5 ; 19...e7-d6 20.g3-h4! h8-g7 21.e1-d2 d8-e7 22.d4-e5 ) 20.f4-e5 h8-g7 21.e1-f2 b6-c5 22.d4xb6 a5xc7 23.e3-d4 e7-f6 24.f2-e3 f8-e7 25.g3-h4 e7-d6 26.c1-d2 ]

[ 19.d4-e5 h8-g7 ( 19...e7-d6 20.e5-f6 ) 20.g3-h4 ]

[ 19...f8-g7? 20.f4-g5 e7-f6 21.g5xe7 d8xf6 22.d4-c5 a5-b4 23.c5-b6 c7xa5 24.e3-f4 g7-h6 25.e1-d2 b4-c3 26.b2xd4 a5-b4 27.d2-e3 h8-g7 28.d4-c5 b4xd6 29.e3-d4 ]

[ 19...c7-b6 20.d4-e5 f8-g7? 21.b2-c3 e7-f6 22.e5-d6 ]

[ 19...e7-d6 20.b2-c3! h8-g7 21.f4-g5 g7-f6 ]