OAKLAND — There’s going to be speed all over the FieldTurf at Cottage Grove High School on Saturday when Central Linn (10-2) and Oakland (9-2) square off at 11 a.m. in a semifinal game of the OSAA Class 2A football playoffs. Let’s start with the Cobras of Halsey, who are eager for a second shot at the Oakers after dropping a 20-0 decision in Oakland during the second week of the regular season. The Oakland defense — which has allowed the fewest points in 2A this season — must contain senior Mark LaCoste (6-2, 185) and junior Josue Avilez (5-9, …