If it's true that it's self evident than why state it incorrectly?Quote from piezoe:
"It takes more than that to roll it." That's self-evident isn't it?
You, in general do not want to exercise a long call that is well forward. If you need to cover your short calls with stock, you will most times be better off selling your long calls and using the proceeds to buy stock, rather than exercising. All let you do the math to prove to yourself that this is true.
Who suggested exercising the long leg as a solution to a calendar that's ITM?
Try doing the math of what happens when you buy stock and it then drops significantly... unless, of course, you believe that "you will most times be better off" converting a losing calendar into a covered call.
