interesting replies from AI on 2 different browsers.....


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No, it is not a foul if the cue ball enters a pocket and subsequently pops back out onto the playing surface. According to standard rulesets like
APA and
BCA, the cue ball is only considered pocketed (and thus a foul/scratch) if it comes to rest in the pocket.
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Cue Ball Pops Out of Pocket — Is It a Foul?
Yes — if the cue ball goes into a pocket and then pops out, it is still considered a foul (a scratch), and your opponent will receive ball‑in‑hand.
Why it’s a foul
In pool, a scratch is defined as the cue ball being pocketed or leaving the table after a shot www.wpa-pool.com+1. The rules do not require the cue ball to remain in the pocket once it enters — if it leaves the pocket and comes back onto the table, the foul has already occurred. The key point is that the cue ball entered a pocket during your shot, which is illegal under the World Pool‑Billiard Association (WPA) and Billiard Congress of America (BCA) rules.