Flat/lookin passes are designed to gain approximately 4-10 yards when successful although they may go for much more or much less (including negative yardage for flat passes but not for lookin passes) depending upon the defensive play called, player movement, player talent (cards and ratings), and the luck of the dice on the play. Short passes are designed to gain 10-15 yards when successful although they may go for more yardage. Long passes are designed to gain 25 or more yards when successful. Flat/lookin passes are the least risky of the 3 pass types as interception and sack chances are low while long passes incur the greatest risk of interception or sack of the 3 pass types. There are 4 defensive plays to choose from: Run, Pass, Short Yardage, and Run-Key. Run and Pass are the primary plays while Short Yardage is designed to focus even more than Run on helping support against a running play (while further weakening the defense against a pass) and Run-Key is designed to focus on attempting to completely stop a specific ball carrier (while very significantly weakening the defense against a pass). In addition, there are many variations of defensive player movement allowed as all linebackers and the free safety are eligible to move into some adjacent zones (or farther in some cases) including blitzing and are eligible to double-team receivers (within limits). For example, a defensive coach may call pass (which does not guard well against a run) and move one or more of his linebackers to the line of scrimmage to blitz (to attempt to sack the Quarterback for a loss of yards) and also to strengthen support against the run; the advantage of blitzing linebackers while calling pass is to increase the chance for a sack and to strengthen support against the run but the disadvantage of this call is that the linebacker would vacate his flat or lookin zone leaving that type of pass with significantly less support. As another example, the free safety who is generally responsible for helping support against the long pass may instead strengthen another zone such as a flat or lookin zone, the offense does not have the capability of changing the play he has already selected but the offense may call more long passes in the future to try to take advantage of the open long pass zone if the defense moves his free safety again. Strat-O-Matic Football draft leagues appeal to many fans of fantasy football. In a fantasy football league participants compile a team of NFL players and as the current NFL season progresses the success of participants' teams is measured by the performance of the NFL players on their team.