Discussion
What is non-chronological backtracking?
Answer: A
Conflict analysis identifies the earliest level at which the learned clause becomes unit, and the solver jumps directly there, skipping levels that had nothing to do with the conflict. Chronological backtracking would undo one decision at a time. Clause age, reverse order and restarting are different mechanisms. Returning to the decision actually responsible, rather than the most recent one, is the same idea as conflict directed backjumping in constraint solving.
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