Score: 19

      2 3
1 3 8 7 5
7 4 5 6 2
3 6 1 8 4
      2 1

Score: 20

      7 4 8  
6 7 8 5 3 1  
5 2 6 1 2 4 5
  8 3 7   6  

Score: 20

      3    
    1 7 4  
6 7 8 5 3 1
5 2 6 1 2 4
4 8 3     6

Score: 20

      8    
      3 6  
    1 7 4  
6 7 8 5 3 1
5 2 6 1 2 4
4 8        

Score: 20

  8          
  3 1 7 4    
6 7 8 5 3 6  
5 2 6 1 2 4 1
4 8