Weekly Extreme Sudoku Competition for Dec 1 to Dec 7

Number 689, Extreme
by Crosswords Ltd. October 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
4         2      
2       3        
    1         9  
8 1   9   5     7
    9       6    
5     7   1   4  
  8         3    
        2       5
      6   7     4