There's almost no way West Ham could beat Southampton on goal differential without also beating them in points so a tie goes to Saints.
That means the magic number is six. If they only win one game, West Ham could still beat them by winning out or winning three and drawing one. If they win and West Ham loses any of their remaining four, it's over.
We could wrap this thing up nicely by Tuesday if a few board members would cooperate. Brighton just needs to beat West Ham which they should be fired up for anyway since it might secure a playoff spot. And maybe Posh could... I dunno... rest Joe Lewis and take a look at their other GK options since Lewis won't be back next year.
The Cubs beat the Cardinals today so you know... one hand washes the other, right?