Well i think you have to loook to the most experienced members of the Death Eaters and order for this one.
Voldemort and Dumbledore would be on par in my opinion.
Then you would have people like Bellatrix, Kingsley, Sirius, Lupin, Snape, Mcgonagall etc. [SPOILER - highlight to read]: Even Molly Weasley after deathly hallows lol
Then id say people like The twins, Percy, Neville, Hermione. Im not sure about Harry, he hasnt really shown any proper skill.
I generally like to view the ten best duelists as follows:
Lord Voldemort
Albus Dumbledore
Gellert Grindelward
Bellatrix Lestrange
Alastor Moody
Kingsley Shacklebolt
James Potter
Serverus Snape
Sirius Black
Minerva McGonagall
I'll post reasons later, but I'm pretty sure that's spot on.
Dolohov was good, also. I'd also probably put Lupin up there, also.
I wish we could've seen more of what James could actually do. It's unfortunate that he left his wand on the sofa. All we've really seen of his dueling abilities was when he was bullying Snape.
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Dumbeldore - (for obvious reasons and the fact Voldemort was scared of him meaning most of the dark side were scared of him.)
Bellatrix - (Because she uses magic as an answer to everything.)
Voldemort - (I know, most people would put him higher, only I reckon really he isn't as prepared to fight he just ends it quickly.)
Flitwick - (Dueling champion as we heard in CoS)
Sirius
Snape (under Sirius because again he was likely to finish things quickly if it was to go to the kill.)
The order (including the twins, Percy, Bill and Charlie) and inner circle all on a par I reckon. (From what we've seen)
Harry, Ron, Hermione, Ginny, Luna and Neville (Because they were the elite at the DA)
The rest of the DA (because they have a lot of spirit!)
Just remember, Remus Lupin, [SPOILER - highlight to read]: with exception the Battle of Hogwarts, never recieved injury while duelling with Death Eaters. He may have been an exceptionally talented duellist, albiet he may not have been. Living amongst feral werewolves, attempting to persuade them to reject Voldemort, however futile, bears merit too.
I like this point, in the Battle at the Ministry it was only Dumbledore and Remus Lupin (out of the Order) that escaped unharmed and if I remember right Lupin was duelling with Lucius upon that occasion.
Tonks was injured by Bellatrix
Moody was incapacitated by Dolohov
Kingsley was defeated by Bellatrix
Sirius was killed by Bellatrix
I think in terms of duelling people always under-rate Remus's abilities and "power" when it comes to magic. Admittedly I am biassed, by no means would I say hes top of the list of duellers but when people like Moody, Snape, Kingsley and McGonogall are on a list I think Remus Lupin should at least be listed among them.
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Harry never quite managed to convince old snakeface that he was his most trusted servant though, did he?
So many factors determine the outcome of these battles; Rowling's pen does more than simply knock off characters on her blacklist. However, if it really boils down to it, it would probably go a little like this.
The Highest Tier - Dumbledore and Voldemort. Undisputed masters of all wand brandishing and both the epitome of their respective alignment. Could well have been Vader and Ben Kenobi, Aslan or Jadis in their place.
2nd Tier - Mad Eye and Kingsley Shacklebolt are up here; Voldermort singles them out as the most powerful aurors in the Deathly Hallows. Mad Eye seems to have degraded with age a little however, or simply his reputation precedes him, rather than his skill. You could shove Bellatrix up there, perhaps Dolohov (having offed Mrs. Wealeys brothers) for good measure.
3rd Tier - Closely following the 2nd (bear in mind, there are exceptions) are the generation of Harry's dad, all the Marauders apart from Wormtail, along with Snape and the majority of his Slytherin flatmates.
It is an injustice to Rowling's writing to boil her fiction down to computer-game physics however.
I'm surprised how low down Snape has been put. He was quite obviously the strongest out of all the Death Eaters, closely followed by Bellatrix. so my list wuld have to be something like this:
1. Voldemort (If Dumbledore felt that he could have defeated him he would have)
2. Dumbledore (When he fought Vodemort in Ootp they seemed on par, yet dumbledore had the Eldar wand which makes me believe that Voldemort was more skillful)
3. Snape (The fact he was able to invent spells such as 'Sectumsempra' while at Hogwarts is quite an achievment, also he had the ability to fly, the only other person shown to be able to do this being Voldemort)
4. Grindelwald (It took everything Dumbledore had to defeat him, yet he had the Eldar wand but was still defeated)
5. Bellatrix (Insane, and very strong)
6. Kingsley (He's often fought multiple death eaters at once and come through unscathed)
7. Sirius/Lupin/James Potter (Probably all on a similar level, but very strong wizards)
8. McGonagall/Flitwick (Past their best, but definately still up there)
I'm pretty unsure about the rest, your never quite sure what Harry is capable of, he was able to work spells such as the Imperius curse and Cruciatus curse, which must take some skill. I was wondering how other people thought harry compared to the people on this list etc?
I wouldn't place Flitwick and McGonagall below Sirius/Lupin/James. I'd probably place Flickwick and McGonagall alongside Kingsley or even Bellatrix, who I think is about equal with Snape, if not slightly stronger.
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I think the Grindelwald is definitely much more duelwise proficient than Snape. Snape's strong but nowhere enough that he could be considered near or even close to Dumbledore which in the Deathly Hallows it is stated that Grindelwald was. Grindel was apparently just slightly behind Dumbledore. But we really can't gauge Sirius too much cause for all we know the only reason he really lost was that he fell in the veil. or even James for that matter.
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Saying Flitwick's among the top is very reasonable, actually. In Chamber of Secrets someone mentions that Flitwick used to be a duelling champion when he was younger. Sure, he's probably past his prime now, but still likely very talented and good at duelling.