3 x 3 (smaller version of the 14-15 puzzle)
1 = 1
2 = 1
3 = 1
4 = 1
5 = 1
6 = 1
7 = 1
8 = 1
123456870
123456780

autolabel

There is no solution for the given starting position,
but swap any other pair of numbers and the puzzle can
be solved.
