© 2000 Todd Neller.  A.I.M.A. text figures © 1995 Prentice Hall.  Used by permission.
IDA* Limitations
•If f is not monotonic, IDA* no longer expands nodes in best-first order
•When searching nodes with f-values less than current threshold, search procedes depth-first.
•f-values of such nodes are ignored in search ordering
•Example: Fig. 2 tree fragment
•Other major limitation: many distinctive f-values à much re-expansion