Weekly Extreme Sudoku Competition for Dec 11 to Dec 17

Number 534, Extreme
by Crosswords Ltd. November 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   6 7     4
  9             7
    7 9   3 5    
5                
      3   8      
        9       8
    8 2   4 9    
4             1  
  5   7 8   4