ref: ec1c1b9b52632a5af59f37c1330573b78775cce1
dir: /sys/games/lib/sudoku/boards/medium-2005-02-01.su/
...2...3. ..9.8.264 1...36.9. 4.3...... .8..2..1. ......8.6 .4.75...3 375.4.1.. .2...8... 864279531 739185264 152436798 413867952 586924317 297513846 948751623 375642189 621398475