Furballs like the ones that happen in the MA did occur historically. I would say that dueling situations were comparatively rarer. Most of the time the loser never saw it coming. That said, furballing is almost an entirely different skill set. It requires high SA, good judgement, and an eye for opportunity. On the other hand, dueling is very much like a game of chess, with the winner invariably being the one who makes the fewest mistakes. (Said person usually being not me.) I've played this game and others like it for years, and I'm still not very good at dueling. That said, here's a few bits of dueling wisdom that I've picked up:
1. Know what your plane will do, and know what the other guy's plane can do, and plan your strategy accordingly.
2. Energy state trumps almost everything, so learn how to read both your own and your opponent's.
3. Learn how to fly your plane while looking out of every view, especially the rear, rear up, up, and forward up views. By this I don't mean just level flight. You need to know how to execute combat maneuvers while looking in any direction. The best practice I've found is to execute a barrel roll until you've got it in your muscle memory, then do it with your eyes closed, then do it looking out a different view.
4. Study the film, study the film and study the film. There's always one spot where you can see the tide of the battle turning.
5. Spend your energy wisely. Know when it's safe to store up some alt at the cost of getting slow, and know when to burn alt to get fast.
6. When all else fails, break away, grab some alt, and get back into the fight.
7. Always try to add an out-of-plane maneuver whenever possible. Add a vertical element, or change the angle of your turn so it is outside the plane of maneuver of your opponent. If he's in a flat turn, go vertical, if he's in the straight-up vertical, make your moves 10 or 20 degrees off. Try not to turn at the same angle as your opponent.
8. Learn to use your roll rate to change direction in the vertical.
Hope that helps.
-Muzzy