Iterative-Deepening Search

• Strategy

  • use a bounded depth-first approach
  • but incrementally increase the depth bound if no solution is found

1 6

2 31

3 156

4 781

5 3906

6 19531

7 97656

8 488281

9 2441406

610348 expansions wasted

3051754 total expansions

depth frontier size

20% wasted effort

(assuming proper depth were known)

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