Score: 15

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

Score: 15

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

Score: 15

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

Score: 15

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

Score: 15

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