Defensive Pass Rush
The average defense rates 8 pass rush points. For every point above or below 8 we adjust the sack percentage by 10%.

  Yards To Goal Line
We subtract from both the completion percentage and average per play as the offense approaches the opponents goal line. The net play result can be reduced by as much as 30%.

 Intended Receiver
Receivers have a major impact on the result of a play:

• Completion Percentage: The number of catches made by a receiver can reduce the percentage by up to 8% for receivers with low catch totals and increase the percentage by up to 10% for receivers with high totals.
• Interception Percentage: The number of catches made by a receiver can increase the percentage by up to 2% for receivers with low catch totals and decrease the percentage by up to 2% for receivers with high totals.
• Yardage:  In general the deeper the pass route the more impact the receivers
  average per catch has on the play. For example, a receiver with an 8 yard
  average will be very similar to a receiver with a 20 yard average on a
  short pass. However, the 20 yard receiver will be much more effective on
  longer routes.

  Offensive Play Call
As a general rule, long passes result in lower completion percentages,
higher sack percentages, higher interception percentages, and higher
averages per play.

  Pass Pattern
Each pattern has it's own unique yardage distribution and characteristics:

• Cross:  Route across the middle of the field. Average chance for a breakaway.
  Slightly better versus man coverage.
• Slant:  Angle route over the middle. Excellent chance for a breakaway. Best versus man coverage.
• Hitch:  Straight curl route. Very predictable yardage result but not a very good chance of a breakaway. Best versus zone coverage.
• Out:  Sideline pattern. Low chance for a breakaway.
• Straight:  Route straight downfield. Best versus zone coverage.
• Flat:  Flair pass.
• Seam:  Pass designed to beat the zone. Not a very good chance for a breakaway. Poor versus man coverage but very effective versus zone coverage.
• Isolate:  Pass designed to beat man coverage. Good chance at a breakaway. Poor versus zone coverage but very effective versus man coverage.
• Fly: Straight route down the sideline. Best versus man coverage.
• Post: Deep slant route. Best versus zone.

  Coverage
In addition to the differences in route versus coverage listed above there are a few basic differences in "man" versus "zone" coverages. Man coverage results are based on individual pass coverage ratings where zone coverages are based on team total rating points. Also, zone coverages tend to be more conservative yielding fewer breakaways but a slightly higher completion percentage.

  Defensive Play Call
Following is a brief description of how defensive play calls affect the play result:

• Pass Defense: Reduces completion percentage by an average of 15%. Also,
  increases interception percentage by an average of 1%. 
• Prevent Defense:  Reduces completion percentage by an average of 15%. Also, increases interception percentage by an average of 1%. Greatly reduces chance for a breakaway or a sack.
• Blitz:  Reduces the average completion percentage by 3 to 25%, increases interception percentage by up to 2%, increases sack percentage by 3 to 25%, increases yards per completion by an average of 3 to 10 yards, and greatly increases the chance for a breakaway. Blitz result variations depend on the number and effectiveness of blitzers.
• Run Defense: Increases the completion percentage by an average of 25%, decreases interception percentage by up to 2%, and increases sack percentage.
• Goal line: Decreases completion percentage by an average of 15%, increases the average gain per play by 5 to 25 yards. Greatly increases chance for a breakaway.

  Double Coverage
Double coverage adjustments are made in addition to the adjustments made based on the defensive play call:

• Doubled Correct:  Decreases completion percentage by an average of 36%, and increases chance for an interception or fumble.
• Doubled Incorrect:  Increases completion percentage by an average of 24% and decreases chance for an interception or fumble.

  Coverage Depth
The depth of coverage affects the completion percentage, interception percentage and breakaway potential of a pass play. For example, "short" coverage will reduce the completion percentage of screens and short passes by as much as 20%, but increase the completion percentage of long passes or bombs by up to 20%. As a general rule the deeper the depth the less chance for a breakaway.

  Play Action
If the defense guesses run the average pass play has the completion percentage increased by 10%. Likewise if the defense guessed pass the completion percentage is decreased by up to 15%.

  Fatigue
Tired receivers or passers will reduce the chance for a completion by up to 15% depending on the level of fatigue.

  Era
Action! PC Football has a built in complex formula which is used to standardize statistics between different eras.

  Wide Receiver Count
The effectiveness of the passing game is reduced with less than 2 receivers.  Playing without wideouts can reduce the completion percentage by up to 15%.

  Home field Advantage
Completion percentages can be increased or decreased by up to 5% depending on the actual stadium.

  Shotgun
Using the shotgun decreases the chance for a sack by up to 15% and reduces the average per play by up to 2 yards. Shotgun also decreases the chance the passer will run.

  Rollout
Using the rollout decreases the chance for a sack by up to 15% and reduces the average per play by up to 2 yards. Rollout also increases the chance the passer will run.

  Randomness
Random numbers are used to simulate the unpredictable nature of football.

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