Sliding tile puzzle suboptimal solver

Hello all.
I wrote a program capable to solve (MxN-1) sliding tile puzzles, such as the Fifteen puzzle. The program can solve puzzles from 2x2 to 11x11.
The main thread is on Speedsolving.com:
http://www.speedsolving.com/forum/showthread.php?38689-kumi-na-tano-3-00-sliding-tile-puzzle-suboptimal-solver
- Bulat