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.

All entries must be in by the end of Saturday, Jan 19 23:59 EST, USA
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