Weekly Extreme Sudoku Competition for Dec 16 to Dec 22

Number 639, Extreme
by Crosswords Ltd. September 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
8     2     7    
  3     5     2  
  7             6
  2   7 4        
4               1
      1   6   9  
6     5       1  
  4     8     5  
    8           3