Weekly Extreme Sudoku Competition for Jan 27 to Feb 2

Number 645, Extreme
by Crosswords Ltd. February 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
8                
    5   4   1    
1 9       2   3 4
    7 5       2  
  3           4  
  6       7 8   1
7 5           8  
    4   2   5    
                3