* Richard E. Korf, Ariel Felner*

We integrate a number of recent advances in heuristic search, and apply them to the four-peg Towers of Hanoi problem. These include frontier search, disk-based search, multiple compressed disjoint additive pattern database heuristics, and breadth-first heuristic search. The main new idea we introduce here is the use of pattern database heuristics to search for any of a number of explicit goal states, with no overhead compared to a heuristic for a single goal state. We perform the first complete breadth-first searches of the 21 and 22-disc four-peg Towers of Hanoi problems, and extend the verification of a ``presumed optimal solution'' to this problem from 24 to 30 discs, a problem that is 4096 times larger.

*Subjects:* 15.7 Search

*Submitted:* May 17, 2006

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