Well had Hamilton won (he was cruising before his accident) and Alonso come 4th after Maldonado's retirement the standings would be Hamilton on 167 and Alonso on 191, a gap of 24. Instead the gap is over double that at 52 points. Hamilton really is a long shot for the title now as he has to take nearly 9 points out of Alonso's lead each race, and that's assuming that Kimi or Vettel don't sneak the title.
I don't care what anyone says, but as well as Alonso has driven this season he has also been rather fortunate, whereas his nearest title challengers hasn't. Alonso has only lost 8 points (assuming he finished where he qualified) in Belgium.
Conversely Hamilton has had a gearbox penalty in China (cost him at least 3 points), two terrible pitstops in Bahrain (at least another 6 points gone, maybe 8), disqualified for no fault of his own in qualifying in Spain (25 points probably, but at least 15), Maldonado deciding to T-bone him in Valencia cost 10 points, then there's this gearbox failure which has cost him a win (25 probably, but 15 at least) He's been cost at least 49 points, but probably 71 points.
Vettel has also been quite unlucky. His alternator cost him 25 points in Valencia and around 6 points in Italy (I can't remember what position he was in.
Sometimes it's better to be lucky...