Weekly Extreme Sudoku Competition for May 5 to May 11

Number 659, 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 9   5          
  1 8     4     2
  4           8  
6       1        
5     2   3     1
        6       5
  7           2  
9     3       1  
      7   8   5 4