Recent content by dr_dave

The CB heads initially in the tangent-line direction off the last OB hit. The tangent-line direction is perpendicular to (90° away from) the direction the OB heads. I illustrate and explain this fairly well in the Tangent Lines section the video; but if you want more info, see the 90° Rule...

With a simultaneous hit, the results would not be at either extreme and would be inconclusive, so no foul would be called. A foul can be called only if the direct or indirect evidence is clear.

No. I am not a pro player or even a top amateur. ... not always live, but after careful video review with several views available, any obvious foul would be easy to call. Thanks. Well, based on all the reasoning, examples, and demonstrations in my video, I obviously disagree 100%.

I am not sure what you mean. There is no jury, so the ref is the "judge and jury" (using everything at their disposal as evidence, including slow-motion video replay). Yes. If the CB heads in the direction implying the wrong ball was hit first, the shot must be called a foul. Any qualified...

A “trained professional referee” should be very competent concerning understanding basic pool ball physics and how tangent lines work. This stuff is crucial to making correct calls confidently. After a careful video review, the correct call should have been figured out. BTW, if any “good...

You are definitely seeing something I am not seeing, and I studied all footage very carefully. It was definitely the wrong call because the 9-first foul is obvious based on all the reasoning and examples in the video. Please watch the entire video again and let me know if you still think the...

A qualified, experienced, and knowledgeable ref most definitely observes CB motion to detect fouls, especially with double hits and this type of shot where tangent line motion tells all.

Thanks. Agreed.

I agree that’s any good player shooting this shot should know right away the CB motion was not even close to what a good player would expect with a good hit if a shot that full.

I would guess Capito knew he fouled, but it is impossible to know for sure. A clean hit (which he expected) looks very different.

“Fired” might be a bit strong, but I agree that the foul should have been recognized during a careful video review. Thanks. I might have exaggerated a little, the foul call certainly would have given Max a good chance at the game and match, and maybe even a chance at the title.

This call was a little tough to make live; but after careful instant-replay video review (with multiple views available), they should have gotten the call right. I tried really hard (about 50-70 shots) to get some of those "in between" cases; but as you point out, it is extremely difficult...

It's all about the "tangent lines," as described and demonstrated in the video.

Same here. Obviously, it would be better if the refs can learn from mistakes like these and try to prevent them in the future so players won't need to get involved. Thanks for sharing that. I know for a fact that many of the top referees do because I have had communication with many of...

FYI, I just posted a new video that analyzes Robbie Capito’s controversial shot against Max Lechner in the recent Hanoi Open Quarter Finals. The shot, which was a foul, was called good, allowing Capito to win the game and the match, taking away Lechner’s chances for a possible tournament...