What is the difference between a threat and a tactic?
These answers restate the rules implemented by our open-source engine, which follows the WXF laws and is regression-tested against the official 110-diagram repetition casebook. Where an answer refers to a specific position, that position lives on the linked reference page, where the build verifies it against the engine before publishing.
Direct answer
A threat is a single move away and can usually be answered; a tactic is a forcing sequence that wins something outright. Every tactic begins life as a threat, but not every threat becomes a tactic, because the opponent often has a perfectly good reply. The difference matters because threats need answering while tactics need calculating through to the end.
Why the distinction changes how you respond
A simple threat can usually be met with a single defensive move. A genuine tactic, by contrast, is a sequence where every one of the opponent's replies has already been accounted for, so a single defensive move will not be enough; the whole line needs answering.
How to tell which you are facing
Ask whether the opponent's move forces you into exactly one reply, or several reasonable ones. If several replies exist and at least one holds, it was a threat. If every reply loses, it was a tactic, and it was already too late to stop it the moment it was played.
Related questions
Can a threat be worse than a tactic?
Sometimes, if the threat is part of a slower plan that a single move cannot fully answer, but that is rarer than a clean tactic.
Should I always calculate threats to the end?
Only the ones that look forcing. Calculating every minor threat as if it were a tactic wastes time and clock.