Score: 12

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

Score: 12

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

Score: 12

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

Score: 12

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

Score: 12

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