Yeah, VGA sorry man, but I think you're wrong on this one. Opportunist and A.S.D. can most definitely be used together.... and an attack roll is definitely not a combat value, so it is not subject to the rule of 3.

I'd go deeper into explaining why I believe it works.... but Quebb already pretty much summed up what I would have said anyway.

This only works if you have Extraordinary Day in play, is what your saying?

I may have came to my conclusions by the wrong method, I'm not sure, I'd have to go back an re-read my post...

...But I never said they weren't compatible. I said they WERE compatible and could be used together. But thanks for the correction. It's not a combat value, so subject to the Rule of 3.

After reading your post, I do see some flaws in my logic.

I did come to the conclusion they are compatible, but I do see some errors. I'll look more closely at it tomorrow, and look at all of my errors.

And it does appear that the Rule of 3 only applies to combat values.

Thanks for the heads up and corrections. I appreciate the help from you and the the7ofDiamonds.

Nope. It works with Extraordinary Day OR with And Stay Down!. Both the BFC and the Feat are spelled the same way : in both case an attack roll resulting in a 11 or a 12 is a critical hit (so a double 6 is no longer needed in both cases)
In fact, the BFC makes a much better combo with Opportunist.

Yeah... but the problem is the BFC can only be played once in a tournament. It's a lot easier to build around the feat.
Another nice thing about Extraordinary Day is that it also redefines critical misses, so Opportunist can be used to neutralize critical misses when EOD is in play.

I know I'm bringing back an old thread, but I don't think the wordings have changed too much and given Osiris' Trait, this will come up more. I can understand the ruling with regard to And Stay Down, but is this the correct ruling with regard to Extraordinary Day?

From the Player's Guide:
Opportunist indicates that you modify the result of the attack roll, not the attack roll itself.

From the Player's Guide:
And Stay Down changes the nature of an attack roll. Now an attack roll result of 11 of 12 is a critical hit. Since Opportunist changes the attack roll result, I see how these two effects interact.

From the Player's Guide:
Extraordinary Day does not change the nature of an attack roll. Rather it changes the rolls that qualify as a critical hit. The language of Extraordinary Day tracks the language for a critical hit normally.

From p. 9 of the 2010 Core Rulebook:
Both require the roll itself, not the result of that roll, to be a specific number.

Given that, I don't think an attack roll result changed by Opportunist to an 11 with Extraordinary Day in play should actually be a critical hit. Is this correct or not? If not, why not?

I would say it is correct because a crit miss with opportunist is still a miss no matter how much you modify it.