I really doubt Bella will be able to take out Alec and Jane, even with Edward's help. Both are old vampires with way more combat training and experience than even Edward. Jacob also said there are some hard-core Volturi fighters there, probably including Felix.
Bella and Edward may be able to take them with the help of Jacob and the imprinted wolves, though; either by using the free wolves as a decoy for the fighters, - should the Volturi not be hostile to Bella and Edward - or just attacking them together. I'm guessing Jane will be unable to keep a pack incapacitated while fighting, and maybe Alec, too.
Hmm. Actually, if they pretend to be friendly, none of the werewolves has talked, and Aro hasn't arrived yet, they might be able to dupe the Volturri into thinking that they were sent there by the Cullen coven to look into something going down on their territory, so as to get close enough to the siblings to be able to sneak attack and disable or kill them and allow the werewolves to polish off the rest.
In the vein of the Harry Potter and the Methods of Rationality discussion threads this is the place to discuss anything relating to Alicorn's Twilight fanfic Luminosity. The fanfic is also archived on Alicorn's own website <strike>(warning: white text on black background)</strike>.
Previous discussion is hidden so deeply within the first Methods of Rationality thread that it's difficult to find even if you already know it exists.
Similar to how Eliezer's fanfic popularizes material from his sequences Alicorn is using the insights from her Luminosity sequence.
Spoilers for the fanfic itself as well as the original novels need and should not be hidden, but spoiler protection still applies for any other works of fiction, except for Harry Potter and the Methods of Rationality chapters more than a week old so we can freely discuss similarities and differences.
EDIT: Post-ginormous-spoiler discussion should go to the second thread. (If you have any doubt on whether you have reached the spoiler in question you have not.)