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Progressive Deepening Search

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Hi ppl, I''ve made a program to find a solution to the 8-puzzle (n-puzzle) using the Progressive Deepening Search algo. I have two versions: -The uninformed search -The informed search (where I use Manhattan Distance, ang the Ring Heuristic) However, I''ve noticed a bug lately.... Everything works fine, BUT, when I try to solve this simple puzzle: Initial Final 0 1 1 3 2 3 0 2 Uninformed: OK Informed Manhattan Distance: OK Informed Ring Heuristic: NOT OK, infinite loop, always on depth==0. I believe this is due to the fact that Initial Ring Heuristic==0. Do you suggest any solution? Is this a popular bug? Note: the Ring heuristic functions OK to other examples where IRH!=0. Thanks Programmers VisualFX

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Look for where IRH = 0 then
cause IRH to be a constant (>0). hopefully later in the search it ''picks up'' again, worse comes to worse; its still a uniform search.

I''m a noooob in this area so take my post with a "grain of salt"?

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