There is something inherently cruel about those two lonely pillars standing at opposite corners of the pin deck. It is the ultimate middle finger from the bowling gods. You throw a pocket hit that looks absolutely flush, yet through some chaotic trick of physics, the 5-pin carries everything except the two most important pieces of wood on the floor. It leaves you staring down 60 feet of oiled lane at a 3.5-meter gap that feels like a canyon. Most professionals just slide one pin into the pit and take their nine count because trying to make it often leads to an embarrassing whiff. But every once in a while, the stars align and a piece of urethane or reactive resin does something that defies logic. Honestly, it is unclear if skill even plays the primary role once the ball leaves the hand in this scenario.
Understanding the Geometry of the Bedposts and Why They Haunt Every Bowler
Defining the Snake Eyes of the Pits
The 7/10 split—often colloquially known as "goal posts" or "bedposts"—consists of the two pins located at the far rear corners of the pin deck. Specifically, we are talking about the 7-pin on the far left and the 10-pin on the far right. In a standard rack, these pins are separated by a distance that makes a direct double-hit with a single 15-pound ball physically impossible. Because the regulation bowling ball is only 8.5 inches in diameter, it cannot occupy enough space to touch both pins simultaneously. This means you have to rely on a secondary reaction. The issue remains that the pins are bolted—metaphorically speaking—into a environment designed to absorb energy, not reflect it. You have to hit one pin with enough velocity and at a specific "thin" angle so that it bounces off the kickback plate, flies across the lane, and topples the other standing pin. Where it gets tricky is the sheer distance involved.
The Physics of the Kickback and Sideboard Interaction
The thing is, most modern bowling centers use high-density plastic or wood sideboards that act as the primary trampoline for a flying pin. To convert the 7/10, a bowler usually targets the 10-pin, aiming to clip its outer edge so it slams into the right-side kickback. If the angle is perfect—and I mean down to the millimeter—the pin will rebound horizontally. But physics usually dictates that the pin flies into the pit or bounces upward into the rafters. People don't think about this enough, but the coefficient of restitution of the sideboards determines whether you have a prayer or if you are just wasting your breath. On PBA patterns, the oil is so thick and the equipment so specialized that the pins tend to stay "down" rather than "flying," which explains why the pros struggle with it more than the Sunday morning league players using ten-pound house balls.
The Hall of Fame of Hitting the Unthinkable on National Television
Mark Roth: The Pioneer of the Impossible in 1980
For decades, the idea of picking up the 7/10 on camera was considered a myth until Mark Roth stepped up in Alameda, California. It was the 1980 ARC Alameda Open. Roth was a power player, a man who revolutionized the game with high revolution rates before it was cool. When he left the split, the crowd settled in for a standard spare attempt. But Roth fired at the 7-pin with such ferocity that it snapped off the left wall and tumbled across the deck to catch the 10. That changes everything for the sport. It proved that human-generated torque could overcome the static layout of the pins. He was the first, and for eleven long years, he was the only one. It is a moment frozen in grainy film, a testament to raw power over finesse.
John Mazza and the 1991 Breakthrough
After Roth, the drought was immense. Then came John Mazza at the 1991 Bud Light Hall of Fame Championship. If Roth was about power, Mazza's conversion felt like a glitch in the matrix. He attacked the 10-pin side, and the pin didn't just bounce; it skittered with a weird, low-gravity energy across the lane. The crowd erupted because they knew they were witnessing something that arguably shouldn't happen. The frequency of these events—occurring roughly once every decade—suggests that the statistical probability of a televised 7/10 conversion is roughly 0.01% of all split attempts. We're far from it being a routine skill shot. Is it luck? Experts disagree, but watching the replay of Mazza’s shot makes you realize that even the best in the world need a favorable gust of air from the ventilation system to make that wood move.
The Modern Era: Jess Stayrook and the Great Anthony Neuer
The list stayed at two for an incredibly long time. Jess Stayrook added his name in 1991 as well, remarkably close to Mazza's feat, during the Tucson Open. But then, the bowling world waited. And waited. For thirty years, the 7/10 split was the white whale of the PBA. That was until a young lefty named Anthony Neuer—nicknamed "The Ginger Assassin"—stepped onto the approach during the 2021 U.S. Open semifinals. Facing the 7/10, he launched a fireball at the 7-pin. The pin slammed the kickback, zipped across the lane like a heat-seeking missile, and erased the 10-pin. The announcer, Rob Stone, famously screamed "C'mon, Ginger Assassin!" as the bowling world lost its collective mind. It was the first time the feat was captured in high-definition 60fps, allowing us to see every frantic rotation of the pin. (It is worth noting that Neuer did not win that match, proving that even a miracle cannot always save a scorecard.)
Technical Barriers: Why Pros Find the 7/10 Harder than Amateurs Do
The Weight and Composition of Professional Pins
You might hear a guy at your local alley brag about hitting the 7/10 three times last year. He might even be telling the truth. However, the conditions are vastly different. Amateur "house" pins are often older, lighter, and have lost some of their structural integrity through thousands of impacts, which makes them jumpy. Conversely, the PBA uses standardized 3-pound, 6-ounce pins that are relatively fresh. These pins are dense. They don't want to fly; they want to fall. Because pro bowlers use 15 or 16-pound balls with high-tech cores, they generate immense impact force, yet the pins are designed to absorb that energy to keep scoring from spiraling out of control. This creates a technical ceiling where the pin weight actually works against the bounce required for the cross-deck travel.
Lane Topography and the Kickback Factor
The kickback plates—the wooden walls on either side of the pins—are the unsung heroes or villains of this story. In many professional arenas, these plates are reinforced to ensure longevity. But if a kickback is too "dead," the pin simply hits it and drops. To get a 7/10, you need a kickback with a bit of "spring," something that returns the energy of the pin rather than swallowing it. This is why certain houses are known for being "high-carry" environments. If the wood is too soft, you can hit the 10-pin at 20 miles per hour and it will just thud against the wall like a wet noodle. It is an infuriating reality: you can execute the perfect shot, but if the physical infrastructure of the lane isn't feeling generous, that 7-pin is staying upright.
Comparing the 7/10 to the Infamous 7-10-4 and Other "Impossible" Leaves
The "Big Four" and the Greek Church
Is the 7/10 truly the hardest spare in bowling? While it is the most famous, many pros would argue that the 4-6-7-10 (The Big Four) or the 4-6-7-9-10 (The Greek Church) are equally demoralizing. Yet, the 7/10 remains the psychological peak of difficulty because there is no "bridge" pin. In a 4-6-7-10, you have a tiny chance of sliding the 4 into the 7 and the 6 into the 10. You have options. With the 7/10, there is no plan B. You either make the miracle happen or you don't. The 8-10 split is technically identical in geometry but is slightly less common for right-handers to leave, making the 7/10 the definitive symbol of a bad break. But let's be honest, seeing a Greek Church converted is impressive, but it doesn't have the same "void-defying" aesthetic as seeing a pin travel 42 inches horizontally across a vacuum of empty space.
The Statistical Odds of Success
If we look at the data from the PBA's tracking systems, the conversion rate for the 7/10 split among professional players is estimated at less than 0.7 percent in non-televised qualifying rounds. That is a tiny window. In contrast, even the difficult 2-10 split is converted with much higher regularity because the 2-pin has a shorter path to travel. The sheer distance the pin must cover—traversing the entire width of the lane—means that even a one-degree deviation in the bounce angle results in a miss. It is the ultimate low-percentage play. Most players at the top level will go their entire 20-year careers without ever converting one under the bright lights of a TV set. It is the hole-in-one of bowling, except the hole is moving and the ball is trying to kill you.
The Anatomy of Failure: Common Misconceptions Regarding the 7/10 Split
Most weekend warriors believe that velocity is the primary catalyst for success when facing the twin pillars of despair. They are wrong. Throwing the ball harder generally results in a steeper deflection angle off the kickback, which explains why your local speed demon usually leaves the pins standing exactly where they started. The problem is that physics does not care about your brute strength; it cares about the coefficient of restitution between the pin and the sidewall. Let's be clear: a ball traveling at 21 miles per hour has less "hang time" in the pit, reducing the chaotic vibration needed to send a pin horizontal. Because the 7 and 10 pins sit at the extreme edges of the lane, approximately 4.75 inches from the gutter's edge, the margin for error is effectively non-existent.
The Myth of the Side-Wall Bounce
You probably think the ball needs to hit the pin directly on its "cheek" to send it flying across the deck. Yet, high-speed cameras from the United States Bowling Congress (USBC) reveal a different reality altogether. If you hit the pin too squarely, it loses horizontal momentum and simply flies into the back curtain. This is where amateurs falter. They aim for the center of the pin, but a successful 7/10 split conversion requires hitting the outer 5% of the pin’s diameter. It is a game of millimeters, not miles per hour. (Unless you are a robot with laser-guided precision, this is largely a matter of cosmic luck.) Is it even possible to master a shot that relies on the chaotic elasticity of a synthetic sidewall?
Surface Friction and Pin Weight Variations
The issue remains that not all pins are created equal. A standard pin weighs between 3 pounds 6 ounces and 3 pounds 10 ounces, but even a two-ounce difference radically alters the deflection physics required for a cross-deck slide. In short, if you are bowling on older, "dead" sideboards, the energy from the pin impact is absorbed rather than reflected. You can throw the perfect shot and still watch the pin wobble and die. As a result: the friction level of the pit area matters more than the oil pattern on the lane itself when attempting to join the elite club of those who have conquered the impossible split.
The Pro’s Secret: Manipulating the Kickback Plates
If you want to know how anyone has ever hit a 7/10 split, you have to look at the kickback plates, the wooden or synthetic panels lining the pin deck. Professional bowlers often look for "active" pits. This means the plates are rigid and have enough spring to return energy to the pin. To maximize your chances, you must aim to hit the pin so it strikes the kickback at a 45-degree angle. This specific trajectory encourages the pin to spin like a top across the lane. Except that most bowlers never practice this, as the odds of leaving this specific split are roughly 0.7% for a professional and significantly higher for a "flat" pocket hitter.
The Weight Block Variable
Modern bowling balls utilize asymmetrical cores to create specific "entry angles" into the pocket, but these cores are useless once the first nine pins are gone. For the 7/10, you actually want a low-friction plastic ball. Why? Because a hooking ball will continue to move toward the center of the lane after impact, potentially blocking the very pin you just tried to kick across. You need the ball to exit the deck as quickly as possible. Data suggests that converted 7/10 splits are 40% more likely to occur when using a 15-pound polyester spare ball than a reactive resin primary ball. But who actually carries a specific strategy for a shot they might see once every 500 games?
Frequently Asked Questions Regarding the 7/10 Split
Who was the first person to convert the 7/10 split on television?
The legendary Mark Roth became the first professional to achieve this feat during the 1980 Alameda Open. Since that historic moment, only a handful of others have repeated the performance in PBA televised history, including John Mazza and Jess Stayrook. Statistically, the conversion rate on the professional tour is estimated to be less than 1 in 150 attempts, highlighting the extreme difficulty of the task. It took over a decade for the second conversion to occur after Roth’s initial success. This highlights the sheer rarity of the event in a high-pressure environment.
What are the actual odds of a casual bowler hitting a 7/10 split?
For the average league bowler, the odds are astronomically low, likely hovering around 1 in 7,000 instances of the split being left. This is due to the lack of consistent ball speed and the inability to hit the precise "sweet spot" on the pin’s neck. Professional machines have simulated this shot and found that even with robotic accuracy, the pin only travels across the deck 10% of the time. The physical properties of the pin deck must be nearly perfect for the bounce to occur. Most amateurs will go their entire lives without seeing one converted in person.
Does the lane surface material affect the conversion rate?
Absolutely, because synthetic lanes offer more consistent "rebound" energy than older wood lanes that may have soft spots. In modern centers, the kickback plates are often reinforced with high-density materials designed to withstand the impact of 16-pound balls. These materials happen to provide a more elastic surface for pins to bounce off. Data from stochastic modeling suggests that newer centers see a 12% higher rate of "pin action" in the pit compared to vintage centers. This makes the modern era the best time in history to actually attempt this miracle shot.
Final Verdict: Luck Over Logic
We need to stop pretending that the 7/10 split is a shot you can "master" through sheer practice or clinical study. While understanding the deflection angles and the importance of a low-friction polyester ball provides a marginal edge, the reality is far more humbling. It is a chaotic event dictated by the molecular vibration of synthetic materials and the specific humidity of the bowling center. I firmly believe that celebrating the 7/10 split as a "skill shot" undermines the beautiful, random violence that makes bowling unique. You can do everything right and watch the pin slide agonizingly past its target by a fraction of an inch. But when that pin finally dances across the dark abyss of the lane to topple its twin, it isn't just physics. It is a momentary lapse in the laws of probability that keeps us coming back to the lanes.