% kuromasu 164 by Otto Janko, http://www.janko.at/Raetsel/Kuromasu/164.a.htm
kuromasu
medium-
13 13
.2.4.4...4...
.......3...4.
2.....2..3..3
.8....9.b..3.
4.5.6..5.....
8.........4.2
5.....3....4.
.....7....6..
..98..4.....4
6......5..5..
..7.......9..
5.a...6.6...3
.d...6....5..
