Weekly Extreme Sudoku Competition for Dec 10 to Dec 16

Number 12, 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
                 
    7 4   2 9    
5   9 3     4   1
    4   6   3    
7               8
    1   8   7    
4   2     7     3
    6 9   5 1