RECORD, TEAM, VS. 3A TOP 15, GD, APRIL, OPP. RECORD (+/-)
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20-1, Greenville, 4-0 vs. T15, +128, 6-0, +28
15-3-1, Dreher, 5-0 vs. T15, +72, 5-0, +21
17-2, North Myrtle Beach, 4-1 vs. T15, +94, 5-2, +73
13-8-1, Brookland-Cayce, 4-2 vs. T15, +48, 6-1-1, +98
17-4, Daniel, 2-1 vs. T15, +86, 6-3, +55
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16-5, Riverside, 5-1 vs. T15, +61, 7-3, +65
16-5, Eastside, 5-3 vs. T15, +53, 3-3, +99
10-5-1, Myrtle Beach, 2-2 vs. T15, +29, 4-0-1, +45
11-9, Chapin, 3-4 vs. T15, +21, 2-4, +43
11-8-1, Socastee, 1-5 vs. T15, +21, 3-5, +93
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14-7-1, Bluffton, 0-1 vs. T15, +54, 4-3, +9
12-7, J.L. Mann, 0-6 vs. T15, +36, 3-2, +9
12-10, Airport, 0-7 vs. T15, +20, 0-7, +50
14-5, Woodmont, 0-1 vs. T15, +68, 7-1, -45
11-2, Marion, 0-1 vs. T15, +56, 2-1, -3
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Yeah Riverside lost to Wando and Spring Valley which are both on the top of 4A. What does the +?? stand for in opp. record?

it means their opponents have 50 more wins than they do losses if it is +50

So basically it is like determining strength of schedule.