One step closer to solving Eternity 2 puzzle

Ok... I'm a bit ecstatic now. I manage to solve 14x14 eternity 2 puzzle in 18ms. That is a major leap for me. From 6 minutes for a 12x12 board, to this result.... I cant be any happier :)

Do I have anything else in mind to improve the code? Not yet. Ah well, I have another strategy, but I'm a bit afraid that the cost of doing it outweighs the benefit. Well... I dont have the 16x16 pieces at the moment. But my friend does. So I'll run the program tomorrow against those pieces.

Wish me luck! :)