QB changing play at line of scrimmage. can someone give me a explanation of how this works?

i know the reasons for changing the play, i've seen the act of changing the play many times, what i dont know is how are they ';coded'; so that the defense will not know the upcoming play too? do the ';codes'; change during the game to keep the D from understanding them? how many different plays are available in audible situations?QB changing play at line of scrimmage. can someone give me a explanation of how this works?
they could be coded in many diffenernt ways: hand signals, colors, numbers, taps. it all depends on the system that is being ran. and if changed it's usually a week to week thing, not in the middle of a game. you'd change them if you felt that teams were catching on to your signals and calls.





you can also have fake signals and 2nd sets of signals. when i played, there might be a number and a hand signal for a route or play. one week i might use the hand signal, the next i might call out the number. depending on the defense i might even change the side of the run play witha number or a color.





football is a very coded sport and can be more cerebral than people give it credit for. offensive lines talk alot and defense also signal and talk alot.





also depending on the level of play, the number of audibles could be unlimited. Manning might usually go to line with 3 different palys to start with, but i know at colleges and high schools (and i would suspect the pros too) where coaches trust their QBs know the playbook, they might have the whole playbook to work with. it might be something they discuse during the week but if they see something, a play could be checked into that wasn't at the top of the game planQB changing play at line of scrimmage. can someone give me a explanation of how this works?
The have a code word that will stand for a certain play.





Ex.





Mango might stand for a certain Counter.





Note- random play and code word.





They aren't changed because it is doubtful that there will be enough audibles called to do the same one twice.
Well peyton for example, has fake plays that he will call out as well, that soud similar.
it depends on the coach and how he wants his audibles to be done. some depends on alot of hand guestures, some rely alot on yelling





to change WR routes if the QB notices good/bad coverages is the QB goes to the line and yells out whatever he wants to. he will usually yell out numbers and colors.


there is a code word usually that alerts either a certain player or the whole team that the play is changing. that word is changed usually. if the QB wants to manually change the Routes he will yell that word, then the number, where to go, then how far. like:


';Red Z Go 12'; meaning the WR on the strong side goes on a streak, for at least 12 yards before breaking the route. in this case RED was the code word for that play.


he might yell YELLOW RED which the Yellow cancels out hte Red. in essense he yells out a word that says ';don't listen to the next thing i say';





usually the number of total play changing audibles is a few. it depends on the QB. Peyton manning is usually given 3 diffrent audibles per play. One passing, one rush to the left and one to the right. these audible plays change each play (Dungy will give out a signal telling him that these are you audibles for this play)


a worser QB may have a 2 audibles PER drive instead. one run and one pass. it all depends on the QB and how ';smart'; he is.





this is also why they made such a big deal about Vince Young's wonderlic test. worrying he whouldn't remember the audibles
They have a bunch of preset ';Audibles'; as they're called, and yes, they do change some of the things they call. Sometimes the play will be read by the defense (This has actually happened many times to the Colts) which will cause them to re-adjust and make the defensive play. I don't know exactly how many they have, as it probably varies from team to team.