It does matter what you put on. In a vol crush, double and triple calendars will likely lose if held through the earnings report. Single calendar can work if the price ends up near the strike, otherwise it will probably lose as well.you dont need backtesting for any earning play (gambles)
it is hardly relevant
you can do it before earning / through earning
you can use calendar / fly / calendarized fly / double or triple calendar / etc
doesnt matter
i am sure someone can get lucky with this type of trade
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not a good and scalable business model though

