Weekly Extreme Sudoku Competition for Jul 10 to Jul 16

Number 512, Extreme
by Crosswords Ltd. October 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
                 
  3     4     2  
      1   6 5    
6     4         9
  7   6 5 8   3  
8         3     7
    4     5      
  9     2     7  
  2 7