See Strength of Schedule for an explanation. There are three sos calculations:
the 1st averages the opponents computer rating based on
 computer margin of victory "Reg In" and "ROM", the 2nd
 is similar to the first but instead of a simple average, it
 weighs games against stronger teams more heavily, and
 the 3rd is based on the RPI SOS formula used by the NCAA. This factor is not used in the power rating calculation.
          
      
   
     
   
           
           

Use the Report Scores link for both scores and missing games.
     
  
  
   
Rank Team                    Total  SOS Ave   SOS Wt Ave  SOS RPI    W  L  T
                             Games Rnk Value  Rnk Value  Rnk Value
 
   1 Snohomish Club            11   1  64.35   1  33.51   1   0.58   5  6  0
   2 Mercer Island Club        12   2  63.67   3  32.72   2   0.58   6  6  0
   3 Wenatchee                 13   3  63.63   2  33.11   5   0.57   6  7  0
   4 Eastside CS, WA           14   4  63.05   4  31.97   3   0.58  12  2  0
   5 Issaquah                  14   5  62.60   5  31.46   4   0.57  13  1  0
   6 Mukilteo                  11   6  62.08   7  31.07   7   0.51   5  6  0
   7 Bellevue East             11   7  62.01   6  31.14   6   0.52   5  6  0
   8 Lake Sammamish Club       11   8  61.60   8  30.69   9   0.49   2  9  0
   9 Overlake School           13   9  60.67   9  29.44   8   0.51  10  3  0
  10 North Kitsap              11  10  59.28  10  27.90  12   0.47   1 10  0
  11 Kennedy, WA               14  11  59.00  11  27.52  11   0.48  12  2  0
  12 Auburn Mountainview       11  12  58.63  13  27.24  13   0.47   3  7  1
  13 Lakeside School Club      12  13  58.63  12  27.31  10   0.48   9  3  0
  14 Ballard, WA               12  14  58.46  14  27.06  14   0.46   6  5  1
  15 Klahowya                  11  15  58.05  15  26.54  15   0.45   4  7  0
  16 Holy Names Club, WA       11  16  57.95  16  26.16  17   0.42   1 10  0
  17 Bainbridge Club           11  17  57.70  17  26.13  16   0.45   5  6  0
  18 Graham-Kapowsin           11  18  57.52  18  25.54  18   0.40   1 10  0