White forced mate down the h-file as follows: 25. Rh8+ Kg7 26. Rh7+ (26. Qh7+! Nxh7 27. R1xh7+ Kf6 28. Rf7 mate also works) 26... Kg8 (if 26... Nxh7 27. Qxh7+ Kf8 28. Qh8+ Ke7 29. Qg7+ Kd6 30. c5 mate!) 27. Rg7+! and Black resigns as 28. Qh8 mate follows. Pia Cramling vs. Karl Mah, Wood Green vs. Cambridge University 1, Division 1