That's a different scenario than the OP
Wow.
Really?
Since you've missed the point: the chances of filling a risk-free fly are about the same as the chances of filling a risk-free spread (i.e., very low but present.) Both of them demonstrate,
in exactly the same way, that your statement about "no risk free trades" is false. That doesn't mean, or guarantee, that the NDX spread will fill - but since it costs nothing to find out, I don't see a problem in playing around with it.
Not sure how is this 2SD out
As anyone who understands the change in risk over time knows, the closer to expiration, the narrower the distribution - and when that fly filled, the body of it was at the 2SD line on the risk graph.
Compared that to the OP which is more than 3 SD away trying to get a fill on a 100 wide spread for 100 where very few if anyone is trading
Again, for those who are slow on the uptake: the
principle behind the trade is far more important than the exact numbers. Based on your belief - which is untainted by little things like actual practice - it would be impossible to fill a fly for 0, since there are "no risk free trades". Me, I'll take reality over fanaticism any time... so I don't really care what you believe or disbelieve. Your ham-handed attempts at irony notwithstanding, the trades I quoted above came from my trade log - and I haven't done any paper trading in years.