% kuromasu 42 by {unknown}, http://www.janko.at/Raetsel/Kuromasu/042.a.htm
kuromasu
hard
17 17
.4......6......2.
3.....5...a.....5
...4....5....3...
..7...........3..
....9.......7....
.......4.3.......
.4.............4.
.....7.....6.....
4.4.....a.....2.5
.....7.....2.....
.3.............6.
.......b.4.......
....5.......3....
..3...........3..
...3....4....2...
4.....7...4.....7
.5......3......6.
