To an almost shocking extent, NFL offenses are homogeneous. Given that every NFL team is in, roughly speaking, the same circumstances in terms of money, resources, practice time, and facilities, this homogeneity makes some sense. After all, “football’s always football,” as newly minted San Diego Chargers head coach Mike McCoy recently said. “Everyone’s running the same plays, and it’s a matter of some running one concept more than another team is. It all boils down to the same thing.”
There are essentially three main offensive “systems” in the NFL: West Coast, Coryell, and Erhardt-Perkins. Given that every NFL team runs basically the same plays, each of these NFL offensive families is differentiated mostly by how those plays are communicated.
To oversimplify, the West Coast offense, made famous by Bill Walsh and still the most popular system in the NFL, uses what is essentially a memory system. On running plays, the same two-digit numbering system as most NFL and college teams is used. Passing plays, however, are typically denoted by the primary receiver’s route, such as Z-In, X-Hook, while the rest of the players are required to memorize their tasks. This system is as old as football itself, which is no surprise given that Walsh’s onetime mentor Paul Brown is credited as much as anyone with inventing the modern conception of huddles, game plans, and play calls. For more than 20 years, this system has been the dominant one in the NFL.
The Coryell system, named after former San Diego Chargers head coach Don Coryell and used by coaches such as Norv Turner, Ernie Zampese, and Mike Martz, is built around the concept of a route tree. Many teams use a route tree (which is the idea that the base route is straight up the field, and the other routes consist of break points off that original path), but the Coryell system uses the tree as the foundation of its play-calling system. For example, the Troy Aikman–era Dallas Cowboys frequently called a play called “896,” which told one outside receiver to run a square-in route (“6”), the tight end to run a seam straight up the field (“9”), and the split end to run a skinny post (“8”). The idea was that, using the route tree, a coach could effectively call any pass combination and all a receiver had to know was the number associated with his route.
In recent years, as offenses and defenses have grown more complex, these systems have started crumbling under their own weight. With multiple formations and personnel groupings, calls that began as “22 Z-In” have gotten unwieldy.
In the Coryell system, the elegance of the three-digit route-tree system has been rendered almost entirely obsolete. Because NFL teams operate predominantly in one-back formations, there are often more than three players running routes, and calling any pass play means having to use both numbers and words (“896 H-Shallow F-Curl”). More critically, the numerical route-tree system gives coaches and players flexibility where they don’t need it and not enough where they do. The “benefit” of a route-tree system is the ability to call any passing concept a coach could dream up, but that option is of very little use. Assuming the route tree has 10 routes (0-9), a three-digit tree gives an offense 59,049 different possible route combinations. That’s absurd. And yet, the route tree by definition only has 10 possible routes, much fewer than any NFL team actually runs. This means that any other route must be called by name, thus defeating the very purpose of having a route tree.
This effectively makes the Coryell system sound a lot like current West Coast offense play calls,1 which have no organizing principle and have morphed into monstrosities like “Scatter-Two Bunch-Right-Zip-Fire 2 Jet Texas Right-F Flat X-Q.” The advantage of a play call like this is that it informs a player of his job better than other systems do. The disadvantage is that it’s excessively clunky, and plays that are conceptually the same can have wildly different calls.
New England’s offense is a member of the NFL’s third offensive family, the Erhardt-Perkins system. The offense was named after the two men, Ron Erhardt and Ray Perkins, who developed it while working for the Patriots under head coach Chuck Fairbanks in the 1970s. According to Perkins, it was assembled in the same way most such systems are developed. “I don’t look at it as us inventing it,” he explained. “I look at it as a bunch of coaches sitting in rooms late at night organizing and getting things together to help players be successful.”
The backbone of the Erhardt-Perkins system is that plays — pass plays in particular — are not organized by a route tree or by calling a single receiver’s route, but by what coaches refer to as “concepts.” Each play has a name, and that name conjures up an image for both the quarterback and the other players on offense. And, most importantly, the concept can be called from almost any formation or set. Who does what changes, but the theory and tactics driving the play do not. “In essence, you’re running the same play,” said Perkins. “You’re just giving them some window-dressing to make it look different.”
The biggest advantage of the concept-based system is that it operates from the perspective of the most critical player on offense: the quarterback. In other systems, even if the underlying principles are the exact same, the play and its name might be very different. Rather than juggling all this information in real time, an Erhardt-Perkins quarterback only has to read a given arrangement of receivers. “You can cut down on the plays and get different looks from your formations and who’s in them. It’s easier for the players to learn. It’s easier for the quarterback to learn,” former Patriots offensive coordinator Charlie Weis said back in 2000. “You get different looks without changing his reads. You don’t need an open-ended number of plays.”
There are essentially three main offensive “systems” in the NFL: West Coast, Coryell, and Erhardt-Perkins. Given that every NFL team runs basically the same plays, each of these NFL offensive families is differentiated mostly by how those plays are communicated.
To oversimplify, the West Coast offense, made famous by Bill Walsh and still the most popular system in the NFL, uses what is essentially a memory system. On running plays, the same two-digit numbering system as most NFL and college teams is used. Passing plays, however, are typically denoted by the primary receiver’s route, such as Z-In, X-Hook, while the rest of the players are required to memorize their tasks. This system is as old as football itself, which is no surprise given that Walsh’s onetime mentor Paul Brown is credited as much as anyone with inventing the modern conception of huddles, game plans, and play calls. For more than 20 years, this system has been the dominant one in the NFL.The Coryell system, named after former San Diego Chargers head coach Don Coryell and used by coaches such as Norv Turner, Ernie Zampese, and Mike Martz, is built around the concept of a route tree. Many teams use a route tree (which is the idea that the base route is straight up the field, and the other routes consist of break points off that original path), but the Coryell system uses the tree as the foundation of its play-calling system. For example, the Troy Aikman–era Dallas Cowboys frequently called a play called “896,” which told one outside receiver to run a square-in route (“6”), the tight end to run a seam straight up the field (“9”), and the split end to run a skinny post (“8”). The idea was that, using the route tree, a coach could effectively call any pass combination and all a receiver had to know was the number associated with his route.
In recent years, as offenses and defenses have grown more complex, these systems have started crumbling under their own weight. With multiple formations and personnel groupings, calls that began as “22 Z-In” have gotten unwieldy.
In the Coryell system, the elegance of the three-digit route-tree system has been rendered almost entirely obsolete. Because NFL teams operate predominantly in one-back formations, there are often more than three players running routes, and calling any pass play means having to use both numbers and words (“896 H-Shallow F-Curl”). More critically, the numerical route-tree system gives coaches and players flexibility where they don’t need it and not enough where they do. The “benefit” of a route-tree system is the ability to call any passing concept a coach could dream up, but that option is of very little use. Assuming the route tree has 10 routes (0-9), a three-digit tree gives an offense 59,049 different possible route combinations. That’s absurd. And yet, the route tree by definition only has 10 possible routes, much fewer than any NFL team actually runs. This means that any other route must be called by name, thus defeating the very purpose of having a route tree.
This effectively makes the Coryell system sound a lot like current West Coast offense play calls,1 which have no organizing principle and have morphed into monstrosities like “Scatter-Two Bunch-Right-Zip-Fire 2 Jet Texas Right-F Flat X-Q.” The advantage of a play call like this is that it informs a player of his job better than other systems do. The disadvantage is that it’s excessively clunky, and plays that are conceptually the same can have wildly different calls.
New England’s offense is a member of the NFL’s third offensive family, the Erhardt-Perkins system. The offense was named after the two men, Ron Erhardt and Ray Perkins, who developed it while working for the Patriots under head coach Chuck Fairbanks in the 1970s. According to Perkins, it was assembled in the same way most such systems are developed. “I don’t look at it as us inventing it,” he explained. “I look at it as a bunch of coaches sitting in rooms late at night organizing and getting things together to help players be successful.”
The backbone of the Erhardt-Perkins system is that plays — pass plays in particular — are not organized by a route tree or by calling a single receiver’s route, but by what coaches refer to as “concepts.” Each play has a name, and that name conjures up an image for both the quarterback and the other players on offense. And, most importantly, the concept can be called from almost any formation or set. Who does what changes, but the theory and tactics driving the play do not. “In essence, you’re running the same play,” said Perkins. “You’re just giving them some window-dressing to make it look different.”
The biggest advantage of the concept-based system is that it operates from the perspective of the most critical player on offense: the quarterback. In other systems, even if the underlying principles are the exact same, the play and its name might be very different. Rather than juggling all this information in real time, an Erhardt-Perkins quarterback only has to read a given arrangement of receivers. “You can cut down on the plays and get different looks from your formations and who’s in them. It’s easier for the players to learn. It’s easier for the quarterback to learn,” former Patriots offensive coordinator Charlie Weis said back in 2000. “You get different looks without changing his reads. You don’t need an open-ended number of plays.”
by Chris B. Brown, Grantland | Read more:
Image: Aaron M. Sprecher
[ed. A little dated (2103) but still relevant.]
