Weekly Extreme Sudoku Competition for Jan 6 to Jan 12

Number 642, Extreme
by Crosswords Ltd. January puzzle packs Now Out!. Thanks for supporting our site.
Future Puzzle - will be submitted on the relevant day
1 2 3 4 5 6 7 8 9
A
B
C
D
E
F
G
H
J
3     2          
9         1     6
        9 7   3  
          6      
  7 4       8 1  
      8     4    
  6   7 2     8  
2     9         5
          4     2