Exeter’s late tries against Ospreys take them to a thrilling new frontier

• Exeter 33-17 Ospreys• Chiefs upset the odds to qualify for quarter-finals for the first timeRarely has mathematics been such a hugely popular subject in Devon on a Sunday afternoon. Exeter’s head coach, Rob Baxter, freely admitted he remained a little hazy on the precise whys and wherefores of the qualifying equations even after the final whistle had sounded. But somehow, against all odds, the Chiefs have topped Pool Two and reached the last eight of Europe’s elite club tournament for the first time, an achievement that had looked all but impossible right up to the closing minutes.As Baxter …