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  • But some puzzles seem particularly tricky, for example when tackling the sudoku puzzle in figure 8 (from Gordon Royle???s Minimum Sudoku collection) the solver using the S heuristic uses only 64 nodes to prove that there is a single solution (no backtracking is necessary), while the solver without the heuristic needs 21,677,544 nodes, for a speedup of 338,711 times.
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