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= Caveats for the options =

Here, we document some aspects of the command-line syntax that may be unintuitive or complicated.

== Setting the "cost type" for landmark heuristics ==

For mostly historical reasons, specifying the cost type (see [[Doc/Heuristic]]) for landmark heuristics is currently complicated. Here's the complete set of rules:

=== If you use the LAMA-FF synergy ===

There are two relevant options:

 1. {{{lm_cost_type}}} of the landmark generation method (currently only used by {{{lm_rhw}}})
 2. {{{cost_type}}} of the synergy declaration ({{{lm_ff_syn}}})

The cost type of the synergy's landmark heuristic is determined by option 1. when using {{{admissible=false}}} and by option 2. when using {{{admissible=true}}}.

The cost type of the synergy's FF heuristic is determined by option 2.

=== If you do not use the LAMA-FF synergy ===

There are two relevant options:

 1. {{{lm_cost_type}}} of the landmark generation method (currently only used by {{{lm_rhw}}})
 2. {{{cost_type}}} of the landmark heuristic declaration ({{{lmcount}}})

The cost type of the landmark heuristic is determined by option 1. when using {{{admissible=false}}} and by option 2. when using {{{admissible=true}}}.

Option 2 is ignored in this case.

== Using preferred operators with the lmcount heuristic ==

Unlike all other (current) heuristics, the {{{lmcount}}} heuristic requires a special setting {{{pref=true}}} to enable preferred operator support. Hence, to use preferred operators with that heuristic, '''two''' things must be done at the moment:

 1. Set {{{pref=true}}} in the [[Doc/Heuristic| heuristic specification]].
 2. Include the heuristic in the list of heuristics in the {{{preferred}}} specification of the [[Doc/SearchEngine|search engine]].