Jump, Massé & Curve

01 — What this episode is

Three shots, five rulebooks, one boundary

When a ball blocks the line, the cue ball has three answers: fly over it, curve around it, or go to the rail and come back. This episode is about the first two: what the rulebooks you will actually play under allow, what makes the shots work, and what each one costs.

These shots sit in a strange spot in league pool. Everyone has an opinion; almost nobody has read the rulebook they play under. The APA permits jump and massé shots in regular play and hands any ban to house rules, but restricts dedicated jump cues to its Masters division rule ³. The WPA defines the legal jump precisely and never once uses the word massé synthesis ¹. BCAPL and USA Pool League events, which run on CSI rules, call any attempt to curve the cue ball around a blocker a massé shot, regardless of how little the cue is elevated rule ². ACS events play the WPA world-standardized rules rule ²¹.

The physics is thinner than the folklore. The rulebooks anchor the jump on a mechanism, a rebound off the bed of the table, while most bar-table lore is anchored on an outcome, the ball got over there. That gap is exactly where fouls, arguments, and house rules live. The physics literature covers the curve family well and the jump only loosely: there is a full mathematical treatment of massé aiming measured ¹³, and there is no instrumented comparison of jump performance across cues anywhere in this research corpus synthesis ²³.

How to read what follows: every claim travels with its evidence tier, every number resolves to the sources registry, and where sources disagree, the disagreement is printed rather than averaged. The interactive diagrams are drawn to scale in table coordinates for both 9-foot and 7-foot tables. The circled hotspots carry the claims and their sources.

02 — The rules map

What the rulebooks actually allow

Five rulebooks read these shots five different ways. Learn your own first, then the tour's. The differences decide what you bring to the table and what you dare shoot.

Start with the definitional core, because it is the one thing the US rulebooks agree on: a jump shot is a rebound. The WPA Rule 2.9 frames it in one sentence: "A jump shot is one in which the cue-ball is made to go over an intervening obstacle such as an object-ball or part of the cushion. Whether such a shot is legal depends on how it is accomplished and the intention of the shooter" rule ¹, and its next line supplies the mechanism: a legal jump is played by elevating the cue and driving the ball down into the playing surface, "from which it rebounds" rule ¹. The APA glossary defines it as striking the cue ball "in a downward fashion, for the purpose of elevating or jumping the cue ball over an impeding object ball to achieve a legal hit" rule ³. The CSI glossary says the same thing in different words: "intentionally causing the cue ball, because of a downward stroke, to rebound off the bed of the table" rule ². Three rulebooks, one mechanism. The ball is legal because it flew, not because it hopped.

The massé side is where the rulebooks part company. The WPA rulebook contains no massé provision at all; a full-text check of the current rules finds no such section, so massé shots fall under the general shot and foul rules like anything else synthesis ¹. CSI's glossary is broader than most players expect: its second definition covers "any attempt... to curve the cue ball around an impeding object ball, regardless of the degree of elevation of the cue or amount of curve" rule ². Under CSI wording, a mild swerve around a blocker is a massé shot, and massé rules apply to it. The APA glossary defines massé in the familiar elevated sense, adds that extreme massé shots improperly executed can cause damage, and lets house rules prohibit jump and massé outright; where they do, house rules prevail rule ³.

Then the scoop, the boundary line under everything in this episode. The APA writes the flat version: intentionally scooping the cue ball over another ball is a foul with ball in hand rule ³. The WPA treats jumping by scooping the same as a miscue, calls the unintentional version a legal jump shot, and files the intentional version under unsportsmanlike conduct rule ¹. CSI splits it the same way: intentional dig or scoop is a foul; the unintentional version is "a miscue, and not a foul in and of itself" rule ². Section 03 shows where that line physically sits.

Equipment is the last fork. APA: jump cues and jump-break cues are Masters-only for jumping, and you may not break down your Regular Shooting Cue to perform a jump shot rule ³. WPA: cue switching between shots is permitted, with spec limits of a 40 inch minimum length, 25 ounce maximum weight, and 14 millimeter maximum tip rule ¹. CSI defines Jump Cue, Jump-Break Cue, and Playing Cue in its glossary and permits switching rule ². The selector below carries the full map, including the two contrast cases: 14.1, where jumping over any ball is simply a foul, and snooker, where it is likewise a foul with narrow exceptions rule ^{1, 20}.

03 — The legal jump

The legal jump is a rebound

The stroke drives the ball down into the slate; the cloth throws it back. The foul lives about one inch lower, where the tip meets the cloth at the same instant the ball leaves.

Mechanically, the modern jump is a compression event. The cue ball is driven down into the cloth, the cloth and slate compress and rebound, and the ball leaves the table airborne. The instruction corpus agrees on the setup that makes that happen: a hard tip for shorter tip contact time, so the cue ball can separate from the tip before it interacts too much with the table surface instructional ⁵, and a relaxed, light grip so the cue rebounds off the ball instead of trapping it instructional ⁷. A jump cue lighter than the ball itself rebounds off the ball on impact, which gives the cue ball more room to clear instructional ⁵.

Why is the scoop a foul at all, when the rebound is legal and the outcome can look identical? The instruction corpus gives three reasons: the scoop is too easy, it is by definition an intentional miscue, and the tip hammering into the cloth and slate is the damage mechanism instructional ⁵. The rulebooks encode it consistently: foul when intended, in APA outright rule ³, in WPA under the unsportsmanlike rule rule ¹, in CSI under the jump rule's intentional branch rule ².

One more mechanic changes how jump cuts aim. An airborne cue ball meets the object ball higher and fuller than a rolling ball would, which enlarges the effective cut angle: jump cuts throw wider than they feel, so aim fuller instructional ⁵.

Officiating reality check, because this foul gets called on television. Dr. Dave's January 2026 column worked through three recent pro scoop-foul calls, including "a shot by Patric Gonzales against Jayson Shaw in the 2025 Philippines Open," and concluded from super-slow-motion reconstruction that on all three "there was no clear visual evidence of a foul"; in the typical scoop the side of the cue never contacts the cue ball, and normal broadcast cameras cannot resolve the contact anyway observation ¹¹. His officiating standard for the borderline call: "A miscue should not be called a foul unless there is clear visual evidence indicating contact with the side of the cue. If the evidence is not clear, the benefit of the doubt always goes to the shooter, with no foul called" instructional ¹¹. The practical takeaway the research prints: an accidental scoop likely stands, but intending one fouls under every US ruleset synthesis ^{1, 2, 3}.

04 — Elevation and speed

Two dials: elevation and speed

Elevation sets the shape of the flight; speed sets its size. Read them as dials, not habits, and note that neither dial has a primary-source number on it.

The relationships come from the March 2011 Billiards Digest column on the jump shot. To jump the cue ball more vertically and have it land sooner, elevate the cue more, and the shot becomes more difficult as the elevation increases instructional ⁷. To jump the cue ball longer and higher at a given elevation, use more speed instructional ⁷. Those two sentences are the whole explorer below: pick the elevation that clears, then buy the landing spot with speed.

Speed is not only range; it is precision. "Force is used to land the cue ball closer or farther from the blocking ball," which is what lets you "very precisely place the cue ball on a jump shot" instructional ⁵. The landing point is the part of the shot that decides what you leave yourself, so the speed dial deserves more practice attention than the elevation dial synthesis ⁵.

Conditions change the dials. A worn or thin cloth makes jump shots harder; laying a spare piece of cloth under the cue ball eases them instructional ⁵. And the difficulty curve rises with elevation: the same source that gives the relationships warns that the shot becomes more difficult as elevation increases instructional ⁷. The working synthesis: use the least elevation that reliably clears the blocker, and spend the rest on speed control synthesis ⁷.

05 — Tip contact

Tip contact: height, side, and the spin you land with

Centerline first. Height chooses what the cue ball does when it lands. And at high elevation, "above center" jams the ball into the table.

The jump shot handout's first accuracy rule is alignment: "carefully align the cue tip with the CB vertical centerline," because an off-center contact is the first listed cause of a missed jump instructional ¹². The centerline is the base geometry. Height, within a window, is what selects the landing behavior.

The window is stated precisely in the March 2011 column: aim the tip between center ball, as the cue sees it, and the resting point of the cue ball on the cloth, and "aim lower when... the cue is elevated more (to reduce the risk of jamming the CB into the table...)" instructional ⁷. The September 2015 column states the same ceiling as a hard limit: "if you attempt to hit the CB above center at such a high cue elevation, you will jam the CB into the table and it won't jump" instructional ¹⁰.

The landing-spin rules, from the September 2015 column's observations with smartphone slow-motion video. Follow is the easy one: the cue ball picks up topspin on every bounce, including the first contact instructional ¹⁰. Stun at the object ball needs the tip slightly below center, and at high elevation "farther below center than you might expect," because almost all of the backspin is lost during the first bounce instructional ¹⁰. Draw after a jump needs "a good hit with the tip well below center and very few bounces," and works best with no bounces at all: hit the object ball on the fly instructional ¹⁰.

Side spin is optional once the centerline holds: "you can also add any other side spin that you wish to" instructional ⁵. And the baby jump belongs here: a modestly elevated stroke with the playing cue and enough speed, with normal spin control intact instructional ¹⁰. That is the shot APA regular-division play is left with when no jump cue is legal rule ³.

06 — Massé and curve

Massé and curve: the BAR method

A curve is a sliding ball whose sideways friction has nowhere to go but around. The aiming method is called BAR, and under normal conditions it runs a little short.

Terminology first, because one rulebook collapsed it. Instructors separate the massé, the extreme elevated curve, from the swerve, the small curve on a slightly elevated stroke, which they call a slight massé instructional ⁸. CSI's glossary instead rules any curve attempt around a blocker a massé shot regardless of elevation rule ². In CSI play, the two words are one rule.

The spin that makes it work comes from the elevated, off-center hit: it produces sidespin and massé spin at the same time measured ²². While the ball slides across the cloth, sideways friction at the contact point turns it; when rolling finally takes over, the path straightens. In the extreme massé case, the spin is so great the ball can roll backward, a negative natural roll measured ¹⁴.

The aiming method has a name and a principle. Coriolis' Principle 25, as quoted in the November 2005 column: the final path of the cue ball runs "in a direction parallel to the line drawn between the initial base point of the cue ball and the aiming point on the table" instructional ⁹. The modern teaching names the parts: B, the tip contact point on the ball; A, the aim point on the cloth; R, the ball's resting point, with the final direction read along R through A instructional ⁸. The mathematical treatment plots real paths at elevations of 70 to 85 degrees and speeds of 6, 9, and 12 miles per hour measured ¹³.

It runs short, reliably: under typical conditions the curve "will usually come up a little short of the predicted direction," so aim for a little more curve than the method indicates instructional ⁸. The November 2005 column names the reasons: squirt effects, the stick deflecting during impact, and cases where the ball jumps and skips instructional ⁹.

Speed and elevation interact in a fixed pattern. More elevation means less speed, and the ball curves sooner; with more speed, the curve takes longer and sends the ball farther down the table before it reaches the final direction; all the paths end parallel to R through A regardless of speed instructional ⁸. Cloth conditions bound the whole family: a high-friction cloth can limit big curves by cushioning the initial impact instructional ⁹. And the equipment lever points the other way from what you might guess: a stiffer, denser shaft produces a larger curve radius, meaning less curve, not more measured ¹⁵.

The stroke and its risks: bridge as high as stable, brace a leg to keep the body still, follow through into the table, and use as little elevation as the shot needs, since too little risks a jam and too much risks the miscue instructional ⁸. The playing cue is suitable for swerves but not for massé, and never with a phenolic tip; the soft tip is what traps the ball long enough to load the spin instructional ⁶.

07 — Jump, kick, or curve?

Jump, kick, or curve?

Pick the option with the most room for error. That sentence, not any chart, is the skill.

The selection principle is stated exactly that way: "always choose the option with the most room for error" instructional ¹⁷. The same source walks a rail-and-pocket example in which the kick usually comes first, the curve second, and the jump last, because the kick needs no exact speed and the jump needs both exactness and no foul instructional ¹⁷.

The jump-or-kick framework from the OZONE lesson adds the geometry: jump when the object ball is mid-table and the cue ball can come straight at it; kick when the obstruction is nearer the object ball or the cut would be near a rail; and ask the deciding question, "where do the balls end up if I do not pocket the object ball?" instructional ¹⁶. The curve's home ground is the mid-table shot with a small obstruction, where it moves the cue ball less than a jump and risks less than a kick instructional ¹⁷.

Price the fouls into the choice. A jumped object ball off the table is a foul under CSI Rule 1-28 rule ²; in 9-ball the jumped 9-ball is spotted and remains a foul under the WPA rules rule ¹. The intentional scoop is a foul everywhere in US play rule ^{1, 2, 3}. And in 14.1 the jump is not a shot at all rule ¹.

Ruleset synthesis, the practical kit bag. APA regular divisions: the baby jump from your playing cue where house rules allow the shot, no dedicated jump cue rule synthesis ³. WPA, BCAPL/CSI, and ACS: the jump cue travels with you, and CSI's massé definition means even a small curve around a blocker is judged under massé-grade rules synthesis ^{1, 2, 21}. The WNT tour rules are silent on both, inheriting the WPA answers synthesis ⁴.

What the professional game actually shows, at three evidence grades. The 2025 Philippines Open produced a documented scoop-foul controversy that a January 2026 column could not resolve even in super slow motion observation ¹¹. A November 2008 lesson documents a pro pulling his jump cue mid-runout to jump over a ball and keep the run alive anecdotal ¹⁶. And the forum history, at anecdotal grade: Jay Helfert's AZBilliards recollection calls Earl Strickland's 1983 Caesars Tahoe jump against Steve Mizerak — played with his playing cue — "the first time I saw a jump shot successfully executed in a major tournament," the same thread holds 1940s film of Mosconi jumping balls as a trick demonstration, and a Cornerman note adds that Strickland shot with "a tremendously hard tip for the times" and complained about others not jumping with their shooting cue anecdotal ¹⁹. The jump is not new; the dedicated equipment is what changed.

08 — Cues and cloth

The cue question and the damage question

Cues: what each one is for, what your ruleset lets you hold at the table, and what the market actually sells. Damage: where the wear actually comes from, and what the rulebooks think about it.

The playing cue is the wrong instrument for real jumps. Playing cues do not jump well instructional ⁵: they are heavy, typically 18 to 21 ounces instructional ^{5, 10}, with a soft tip and, in the modern default, a low deflection carbon shaft that is documented to jump "small amounts reliably" instructional ⁵. That ceiling is why the baby jump and the real jump are different shots.

The dedicated jump cue is the opposite animal: short, light, stiff, with a hard tip, often built as a three-piece instructional ⁵. Practitioner figures put jump cues around 6 to 10 ounces and about 40 inches anecdotal ¹⁹. No instrumented comparison of jump performance across cue types exists in this corpus; the playing-cue-versus-jump-cue gap rests on mechanism and consensus, not measurement synthesis ²³.

The massé cue sits between: shorter and heavier than a jump cue, with a soft tip that traps the ball for spin, commonly 46 to 52 inches and 19 to 21 ounces, up to 30 ounces or more, with artistic-billiards cues around 50 inches and 24 ounces instructional ⁶. Note the rule collision: the WPA caps cue weight at 25 ounces and minimum length at 40 inches, so a 30 ounce custom massé cue is not legal equipment in WPA play rule ^{1, 6}.

The two-cue rule interactions decide what you can actually hold at the table. In APA regular divisions, the dedicated jump cue stays in the case: Masters-only, and breaking down your Regular Shooting Cue to jump is prohibited rule ³. A dedicated break cue with a removable butt is a separate question from breaking down the shooting cue: the APA limit is about jump equipment, and the WPA answer is that switching between shots is simply permitted within the specs rule synthesis ^{3, 1}. For a BK Rush+ owner, the documented conversion is the practical one: the front unit serves as a jump cue once the handle is off synthesis ²¹, legal in WPA, CSI, and ACS play, and APA Masters-only for jumping rule ^{1, 3}.

Damage, then, is where the anecdotes earn their keep. Jump shots leave dot-like burn marks on cloth, and the wear reports are specific: the marks come from the ball, not the cue anecdotal ¹⁹. The same thread holds that a jump done properly does no more damage than a strong break anecdotal ¹⁹. Massé wear is the tip-and-slate mechanism, and there is even a report of dented rails from deliberate massé practice on one home table anecdotal ¹⁹. The protective habits are cheap and documented: a spare piece of cloth under the cue ball for jump practice instructional ⁵, and landing jumps on a pad rather than bare cloth anecdotal ¹⁹.

The market in four tiers

Brands sort by construction before they sort by name. The entry tier is budget production — Viper, Players, Rage, Action and their peers — wood and composite breakers typically under $150, with basic hard tips and none of the front-end engineering secondary ³¹. The mid tier is the American production houses: Joss’s Thor Hammer break cues at roughly $319–$336 on current dealer sheets, Pechauer’s break line around $351, and Lucasi’s Hybrid breakers — the Big Beulah 2 and the L2000JB jump/break — documented in the corpus with their four-piece butts and adjustable weights secondary ^{21, 31}.

The premium tier splits in two. Predator’s BK4 is the wood outlier: $429–$469, Vault Plate front end, KTRL synthetic tip, and a Uni-Loc weight cartridge offering roughly thirty combinations primary ^{26, 31}. Then the carbon flagships: Mezz’s Power Break Kai with the Deep Impact 2 shaft and Sonic tip at about $640–$690 in US listings, and Predator’s Black BK Rush line at $849–$999, with the BK Rush+ jump/break at $899–$949 secondary ³¹. Prices in this subsection are a September 2026 retail snapshot and will drift; the construction tiers will not. Custom cuemakers build break cues too, but the corpus documents none of them at spec, so none are priced here synthesis ²¹.

Loved and hated, as the forums tell it

Everything in this subsection is sentiment — aggregated practitioner opinion, forum-grade by definition anecdotal ^{27, 28}. The loved list currently starts with the Predator BK line: “the most impressive cue I’ve ever tried” and “as good of a break cue as you can find” sit in r/billiards threads from 2023 to 2026 anecdotal ²⁷. The hated list contains the same cue: “I broke with a BK Rush last night and was NOT impressed…at all.” Both verdicts are live in the same community within the same two seasons, which is the honest state of that argument anecdotal ²⁷.

Underneath the disagreement, the pattern holds. Loved is felt power and a solid hit: the Mezz Power Break Kai draws respect in the same threads as a serious breaker anecdotal ²⁸, and the Gulyassy Sledgehammer jump/break earned “hits a ton” in the long-running review threads, its one recurring complaint being the thick shaft anecdotal ²⁸. Hated is the cheap end of the market — graphite and fiberglass composite breakers pan out in forum hands as dead-feeling and loosely built, with tips that wander or fly off and a warping habit anecdotal ^{27, 28}. The money argument runs both directions: the same community repeats that “the amount of money you pay for a break cue wont make your break better,” while pointing each other at the flagships when budget is no object anecdotal ²⁷. Carbon splits the room — praised for warp-proof consistency and easy speed, called stiff or dead by players who want wood feedback anecdotal ²⁷. What no thread settles is outcome: no measured comparison links any brand, price, or material to break results, which is why every verdict above stays anecdotal synthesis ²³.

What is actually new

Four changes separate the current generation from a decade-old break rack. First, carbon break shafts became a category instead of an experiment: Predator’s REVO BK-R under the BK Rush line, Cuetec’s Cynergy carbon break shafts, and Poison’s Venom-shaft break/jump all ship the same idea — a stiffer, lower-flex front end aimed at consistent energy transfer and warp-proof life secondary ²⁹. Second, tips became systems rather than parts: the BK Rush+ layers its seven-ply BK-Hybrid leather tip over an FR4 R-Break Shield, Predator’s own “phenolic power with leather control” pitch primary ²⁶, while the BK4 runs the KTRL synthetic and Mezz ships the Sonic on the Deep Impact 2 primary ²⁶, and Cuetec’s Cynergy Propel jump cue carries a Taom 2.0 break/jump tip on an oversize 13.9 mm front secondary ³⁰.

Third, modularity. Three-piece jump cues with interchangeable handles, quick-release joints, and Uni-Loc weight cartridges are now the standard shape of the type; Predator’s Air Rush is the template case — Air REVO carbon composite shaft, swap-in handles, weight cartridge, and a 14 mm phenolic tip backed by a carbon shield, listed at $599–$659 secondary ^{29, 31}. Cuetec’s Propel pushes the idea further: an all-composite jump cue that lists 11 ounces only once its weighted extension is attached secondary ³⁰. Fourth, conversion: the break-jump hybrid went mainstream, from the BK Rush+ handle-off front unit primary ²⁶ to Poison’s three-piece convertible secondary ²⁹. Marketing travels with all of it. The claims worth keeping are the ones with numbers, and they are below.

What to expect from each setup

Weight first, because it is the part with real numbers. Raising a break cue from 17 to 22 ounces buys about 6% more cue-ball speed and 13% more delivered energy at equal stroke speed — real, but small, and paid for in acceleration you must actually produce measured ²⁴. Dr. Dave’s working position is that the best cue is the one that produces the fastest accurate break, which lands most players near 19 ounces: a lighter cue tends to win at equal effort, a heavier one only wins if you can still fully accelerate it primary ^{24, 25}. The BK4 and BK Rush+ both list 19 ounces as standard, with options on either side — the market converged on the same number primary ²⁶.

Tips next. The instrumented gap runs from a typical medium-hard leather tip at 0.73 coefficient of restitution to phenolic at 0.81–0.87 — roughly 11–17% more break power for the hard tip measured ²⁴. Phenolic buys that speed and takes the margin away: the pros in Dr. Dave’s interviews describe it as a centered, straight-through instrument whose mishits are unforgiving, which is why some keep very hard leather for the position feel primary ²⁵. The hybrid tip systems — leather plies over an FR4 shield — are the commercial attempt to hold both ends of that trade at once primary ²⁶.

Two expectations survive the sentiment, and both point the same way. Repeated maximum-force strokes wreck playing-cue tips and ferrules, which is the argument for a dedicated break cue that survives every thread secondary ²¹. And the aim-minded note that carbon break fronts move the pivot point further back than a maple playing cue — and further still than a thick wooden break cue — which changes how much sweep a slightly off-center break asks for anecdotal ²⁷. Everything else on the showroom floor is a claim, not a measurement synthesis ²³.

09 — Conclusions

Conclusions that survive the sources

Five findings the sources will actually sign. Where the evidence is thin, the thinness is the point.

1. The jump is a rebound, not a hop

   Every US rulebook in play defines the legal jump by its mechanism — an elevated cue driving the cue ball down into the playing surface, from which it rebounds — and every one of them fouls the scoop, the look-alike shot where the tip contacts the cloth and the ball at the same instant. Learn the boundary as a strike, not a result. rule ^{1, 2, 3}

2. The word “massé” is where the rulesets really diverge

   The WPA rulebook never uses the word — a verified full-text absence — so curve shots there ride on the general shot and foul rules. CSI defines any curve attempt around a blocker as a massé shot regardless of elevation. APA permits by default and hands any ban to house rules that must prevail. Same word, three different contracts. rule synthesis ^{1, 2, 3, 23}

3. Equipment legality is decided by division, not by physics

   The WPA specs (40 inch minimum, 25 ounce maximum, 14 millimeter tip) plus permitted cue switching mean the jump cue travels with you in WPA, BCAPL/CSI, and ACS play. APA confines dedicated jump cues to Masters divisions, bans breaking down the shooting cue, and leaves the regular division the baby jump. rule synthesis ^{1, 2, 3, 21}

4. The aiming methods agree with each other more than the folklore does

   Jump: elevation sets the shape of the flight, speed sets its size and the landing point, and the landing is what decides the leave. Curve: the BAR method predicts the final direction, all speeds end parallel to it, and real curves run a little short under typical conditions. What no primary source provides is a degree figure for jump elevation — the method is relationships all the way down. instructional measured ^{5, 7, 8, 9, 13}

5. The evidence thins exactly where the arguments get loud

   No measured study compares jump performance across cues; the 45-and-60-degree figures fail verification; no sourced injury data exists in either direction; and the pro history is forum-grade. This episode prints those gaps instead of filling them — the loudest claims in the room are the ones the corpus cannot support. synthesis ²³

10 — Sources

Every number, named

Every number and quotation in this episode resolves here. The role tag on each entry says what kind of evidence it is and how hard it can be pushed.

Flagged: not verified

These claims appear in the research corpus but did not survive verification against a primary source. They are printed where relevant with the unverified tag; they are collected here so the gap is impossible to miss.

• ⚑Jump-elevation degrees (“about 45 degrees, up to 60 for very short hops”). One secondary source only (Pool Table Portfolio, 2025). No primary instruction source fixes jump elevation in degrees; Dr. Dave teaches relationships only. The diagrams in this episode show relationships, never degrees.
• ⚑Jump-cue specs “6–10 oz… around 40 inches.” Practitioner forum quotes (AZBilliards), not manufacturer specifications; the same goes for the massé-cue ranges (19–21 oz, 46–52 inches, up to 30 oz or more) and the artistic-billiards cue (“maybe 50 inches and 24 ounces”). Only the WPA §17 limits are primary.
• ⚑No measured study compares jump performance across cues. Jump cue vs playing cue vs broken-down cue: comparative claims are mechanism-based or product-page. One academic simulation covers cue-material effects on curve shots only. The market subsection added in September 2026 inherits the same gap: brand, price, and material comparisons there are sentiment aggregation and product-page claims; no measured break-performance data distinguishes any brand or price tier.
• ⚑No sourced player-injury data exists for jump or massé play, in either direction. The documented risks are to cloth, rails, and equipment. This absence is stated, not a safety clearance.
• ⚑“Jump cues were not allowed on some pro tours” (2008 instructional claim). No current tour restriction verified; the 2026 WNT Event Rules contain no jump or massé clause at all.
• ⚑Dr. Dave’s massé aiming FAQ page was unreachable (bot check) during research. The BAR-method content comes from the Billiards Digest articles and TP A.19 that the page itself points to.
• ⚑“Mezz Power Break Exotec” as a break-cue model. The name appears in secondary roundup copy, but no manufacturer page confirms it; Mezz’s own site lists the Power Break Kai and legacy Power Break models with Deep Impact 2 shafts. Use Power Break Kai / Deep Impact 2 as the citable Mezz break reference.