1.f5!!
A thematic breakthrough, missed in the actual game by Lasker, who played 1.Kf6? and, after 1... Kb5 2.Ra1 a4 3.f5 exf5 4.e6 fxe6 5.Kxg6 f4 6.h5 f3 7.h6 e5! 8.Re1 a3 9.Rxe5+ Ke4 10.Re1 a2 11.h7 Ra8 12.Kg7 f2 13.Ra1 Kb3 14.Rf1 a1=Q 15.Rxa1 Rxa1 16.h8=Q Rg1+ 0-1
1...	exf5
2.e6!	fxe6
3.Kxg6
And the White h-pawn gets through at the expense of the Black rook
Lasker-Levenfish (1935)