Bright Osayi-Samuel and Mark Cullen gave Blackpool's promotion hopes a boost as their second-half strikes consigned Stevenage to a 2-0 defeat.Both teams were locked on 27 points going into the game, just outside the play-off positions, and substitute Osayi-Samuel's curled finish from the edge of the box initially separated the well-matched sides.Cullen scored a late second to seal Blackpool's eighth league win of the campaign following their 4-1 win against Newport in their last league outing.The first half was a close affair as Tom Pett and Kyle Vassell impressed for Stevenage and Blackpool respectively.In the second half Brad Potts was unable to find the target from a free header and Fraser Franks forced a save from Sam Slocombe.Eventually 18-year-old Osayi-Samuel broke the deadlock in the 77th minute with a curling finish past Chris Day from the edge of the box - his first senior goal.Cullen then took advantage of Dean Wells' slip to pick the ball out of the air and fire in six minutes from time.