% kuromasu 6 by Warai Kamosika, http://www.janko.at/Raetsel/Kuromasu/006.a.htm
kuromasu
medium-
9 9
.5.......
2.5......
.5...b..a
5.7...3..
.5.6.9.6.
..5...4.9
2..7...6.
......6.a
.......6.
