Discussion
What is forward checking?
Answer: D
When a variable is assigned, forward checking deletes conflicting values from the domains of the variables it constrains, and backtracks immediately if any domain becomes empty. It catches failures much earlier than plain backtracking and supplies the domain sizes the minimum remaining values heuristic needs. Full consistency checks, deeper lookahead and feasibility proofs are different operations. Inference interleaved with search, rather than performed once at the start, is the organising idea of the whole topic.
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