on running, makes it particularly popular as a youth football formation. In 2023, the Jacksonville Jaguars used the T formation during a playoff game against the Los Angeles Chargers, successfully converting a fourth-and-one for 25 yards to set up the game-winning field goal. Evolution The Chicago Bears T made great use of "man-in-motion" effectively making one of the three running backs into a receiver as he left the backfield. Thus, the T, originally designed as a more dynamic running offense, became a far more powerful passing offense than the single-wing, greatly enhancing its appeal. The two-back backfield naturally evolved into the "pro set" with only two running backs in the backfield and a "flanker" permanently posted out in a wide receiver position. Teams initially used a flanker primarily in the "slot" (on the strong side) because the hashmarks were still quite wide, as in college ball. In 1972, the hash marks were moved to their present position, 70 feet, 9 inches from each sideline. This made the strong side / weak side far less of a factor and allowed the opening up of the passing attack. The pro set further evolved into today's complex offenses. Prevalence Virtually all modern offensive formations are variations on the T theme. A notable exception is the Shotgun formation, first used by the San Francisco 49ers in 1959/1960, popularized by the Kansas City Chiefs in the 1960s and the Dallas Cowboys in the 1970s, and now widely used in pro and college football. The "I formation", first popularized in the AFL by the Kansas City Chiefs, circa 1968, is another variation of the T used extensively by high school and, until recently, many college teams. The I is a strong running formation, with the fullback positioned forward with a tailback behind, providing mass at the point of attack. The "power I" places all three running backs in a line behind the quarterback, making it a very powerful running formation but difficult to pass from. The Chiefs of the late 1960s often sent one of the three backs in motion. The Wishbone formation, once dominant in college football but now virtually extinct, was another T variation, with the fullback positioned very close behind the quarterback, flanked by two halfbacks. This was a very strong running formation with the famous "triple option" where the quarterback could handoff to the fullback, run it himself, or pitch to the