Weekly Extreme Sudoku Competition for Jan 1 to Jan 7

Number 850, Extreme
by Crosswords Ltd. December 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   6
  8     6     2 5
      8       7  
9     4   2   5 8
                 
5 7   9   8     3
  2       3      
1 5     4     9  
4   7           2