Weekly Extreme Sudoku Competition for Jan 13 to Jan 19

Number 643, Extreme
by Crosswords Ltd. January 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
  5     7 1     3
      3   9      
  4     8     6  
          5   9  
2               6
  7           4  
  6     5     1  
      9   3      
8     7 1   9