Weekly Extreme Sudoku Competition for Feb 10 to Feb 16

Number 647, 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
  7     2     1  
5     3         7
  6 3 7     8    
      1          
4           9    
          4      
    7     3 6 4  
6         5     8
  2     8     9