goalposts. Thus most touchdown throws are aimed away from the centre portion of the end zone. In the CFL, the goalposts have the same construction as the NFL posts, with the centre post being about 2 yards deep in the end zone. It is extremely rare for CFL passes to hit any part of the posts. When this occurs, a dead ball results. Occasionally, receivers can use the post to good effect in a 'rub' play to shed a defender. End zone passing becomes even more complicated when the corners of the end zone are truncated, as is the case at stadia where the field is bounded by a running track. However, the offensive team enjoys a counteracting advantage of end zones more than twice the size of those in American football (20 yards with a wider field), significantly expanding the area that must be covered by the defensive team and also allowing the freedom to run some pass patterns not available in American football's red zone. Moreover, the rule requiring only a single foot to be in bounds upon pass reception in Canadian football further stretches the amount of area that the offenses have to work with. NFL offenses generally try a run between tackles when on the one-yard line. CFL offenses make similar attempts on first down on the one-yard line, but second and third down attempts, if required, can be much more varied than their NFL counterparts. Special teams The frequency of punts is highly dependent upon the success, or lack thereof, of the offense. Punt returns are ubiquitous in Canadian football because the "no-yards" rule permits virtually every punt to be fielded and returned. Moreover, if the kicking team punts the ball out of bounds in an attempt to forestall a return and the ball goes out of bounds between the two 20-yard lines without touching the ground first, a 10-yard penalty is assessed and the ball advanced from where it left play, or the kicking team is backed up 10 yards and must replay the down. "Shanked" punts are therefore extremely costly to the kicking team. Though missed field goals may be returned in both national rule sets, the deeper end zone and goal post positioning make this much more common in Canadian rules. TSN on-air analysts state that they are the single play-from-scrimmage most likely to result in a touchdown. This set of special