George Riley presents a comprehensive look at the second round of the Super League Super 8s.High-flyers Hull FC return to the home of the Widnes Vikings looking to avenge the 46-6 mauling they suffered there earlier in the season. Fellow Challenge Cup finalists Warrington have a swift rematch with Wakefield, who they put 56 points past on their way to Wembley a fortnight ago. And there is the pick of the action as Castleford play Wigan and Catalans travel to St Helens.In the qualifiers, Leigh face local rivals Salford, Leeds meet Hull KR, Huddersfield entertain Featherstone and London take on Batley, as all eight teams compete for places in next year's Super League.