[ 3.c7-b8 a5-b4 4.c3xa5 a3-b2 5.b8-d6 ( 5.a5-b6 b2-c1 6.b6-a7 c1-d2 7.e3xc1 g5xg1 8.b8-d6 h4-g3 9.d6xh2 g1-d4 ) 5...b2-a1 6.d6-c5 a1-c3 7.c5-b6 c3-d2 8.e3xc1 g5xg1 ]

[ 5...b2-c1 6.f2-g3 h4xd4 7.d8xh4 c1xg5 8.h4xc3 ]

[ 6...a1-d4 7.e3xc5 g5xg1 8.d8-a5 g1xb6 9.a5xc7 ]

[ 7...h8-a1 8.d8-a5


Key position. C3 is protected and black king has no safe move on b2-h8 a1-b2


( 8...a1-f6


9.f2-g3 h4xd4 10.a5-d8 g5xe3 11.d8xd2 ; 8...a1-h8


9.f2-g3 h4xd4 10.a5-d8 g5xe3 11.d8-f6 h8xe5 12.b8xd2 ) 9.f2-g3 h4xd4 10.a5-d8 g5xe3 11.b8-e5 d4xf6 12.d8xa3 ]

[ 7...h8-g7 8.d8-a5 g7-b2 ( 8...g7-f8


9.f4-e5 f8-a3 10.e3-d4 a3-f8 11.a5-b4 f8xa3 12.e5-f6 g5xe7 13.d4-c5 a3xd6 14.b8xh2 ) 9.f2-g3 h4xd4 10.a5-d8 g5xe3 11.b8-e5 d4xf6 12.d8xa3 ]

[ 8...c3-b2 9.f2-g3 h4xd4 10.a5-d8 g5xe3 11.b8-e5 d4xf6 12.d8xa3 ]

[ 8...c3-f6 9.f2-g3 h4xd4 10.a5-d8 g5xe3 11.d8xd2 ]

[ 8...c3-g7 9.f2-g3 h4xd4 10.a5-d8 g5xe3 11.d8-f6 g7xe5 12.b8xd2 h6-g5 13.d2xh6 d4-c3 14.h6-c1 ]

[ 9...a1-g7 10.f2-g3 h4xd4 11.a7xg1 g5xe3 12.g1xh8 ]