ref: bf2a6f786502026ce4229bc84a6a22e5e55a7c13
dir: /sys/games/lib/sudoku/boards/veasy000.su/
361.259.. .8.96..1. 4......57 ..8...471 ...6.3... 259...8.. 74......5 .2..18.6. ..547.329 361725948 587964213 492831657 638259471 174683592 259147836 746392185 923518764 815476329