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Caveats for the options
Here, we document some aspects of the command-line syntax that may be unintuitive or complicated.
Using "preferred operators" with landmark heuristics
Unlike all other (current) heuristics, the landmark heuristics (landmark_sum and landmark_cost_partitioning, see Doc/Evaluator#Landmark_sum_heuristic and [[Doc/Evaluator#Landmark_cost_partitioning_heuristic) require a special setting pref=true to enable preferred operator support. Hence, to use preferred operators with these heuristics, two things must be done at the moment:
Set pref=true in the heuristic specification.
Include the heuristic in the list of heuristics in the preferred specification of the search engine.