Domdaniel: Demmit, but <ccg> seems to be right.
20.Bxh7+ Kxh7 21.Ne4 is winning for White. In most lines the WQ gets in via one of the light squares d1/e2/d3, depending on Black's defence.21.Ne4 dxe3 (the Grabitall Defence) fails to 22.Qd3 f5 23.gxf6 Bxf6 24.Nxf6+ Kg7 25.Qh7#.
Obviously there are many lines that put off mate for a few moves (the Apotropaic Defence), but they don't help the Black cause much.
21.Ne4 Be5 22.Qd1 Bxf4 (or 22...Rh8 23.Rxf7+) 23.Qh5+ Kg8 24.Rxf4! with mate in due course.
There *is* a vaguely pleasing symmetry between the way different pieces are left in situ to be taken by Black pawns: the Rf1 in Short's actual mating line, the Be3 here.
However, Nigel's 20.Qe2! remains an esthetically pleasing move. This may not count for much with brutal pragmatic types, but <mack>, Nigel and I are agreed that there's more to life than robotic efficiency.
Like the late great Eduard Gufeld, you have to hope to create a Mona Lisa. Or paint a moustache on one, in the Duchamp mode.
Still, I suppose it's possible to play Bxh7+ *ironically* ...