 (driving White's king to the corner) 28.Kh1 Rxf4!White cannot capture the rook because of the back-rank mate with Qd1.He could maintain a large advantage with 29.Rg1!, when 29...Qxb2 would be met by 30.Rh8 Nf6 31.Re1+ Ne4 (or 31...Re4 32.Re8!+ Nxe8 33.Rxe4+ and 34.Qxe8) 32.g3 Qc3 33.Rxe4+ Rxe4 34.Qe8+ Kf6 35.Qxe4 and wins.