Weekly Extreme Sudoku Competition for Jan 8 to Jan 14

Number 538, 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
2   3     7     4
  6         3 9  
          3      
7 9   3         6
    5 7   4 8    
4         5     2
      8          
  5 1         2  
8     2     4   1