*-----------*
|6..|38.|...|
|...|7..|894|
|...|...|..3|
|---+---+---|
|.6.|2..|..9|
|.1.|.4.|.3.|
|8..|..6|.7.|
|---+---+---|
|7..|...|...|
|459|..1|...|
|...|.97|..8|
*-----------*