Discussion
How does a solver choose which variable to decide on?
Answer: A
Activity based heuristics score variables by how often they appear in recent conflict analyses and decay the scores over time, which focuses the search on the currently difficult part of the problem. Textual order performs poorly, domains are boolean, and pure randomness wastes the information conflicts provide. Letting the search's own history direct its next choice is a form of learning within a single run and it is one of the reasons modern solvers perform as they do.
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