*-----------*
|...|9.2|..1|
|..1|..6|.5.|
|98.|54.|...|
|---+---+---|
|43.|7..|..8|
|...|.2.|...|
|6..|..9|.23|
|---+---+---|
|...|.14|.89|
|.1.|6..|2..|
|7..|2.8|...|
*-----------*