Thief of Always said:I was hoping for something compatible with d20, but really anything will work for me. I need something that sets dueling apart from other forms of combat, a way to reinforce the intimacy and atmosphere of dueling.
1 Roll initiative every round, rather than just at the beginning. Nothing is quite as boring as two combatants taking turns.
2 Use the active defense rule, where a player rolls 1d20+ bonuses for AC, rather than taking 10 (effectively).
3 Duelists should have power attack, expertise, and combat reflexes for the best options.
4 Use actions like bull rush, disarm, and trip as part of attack sequences, rather than just attack-attack-attack.
5 Disallow AoO for the combat, since the duelists are completely focusing on just each other. Instead, let them sacrifice AoO attempts to parry (opposed attack roll, yours has to beat theirs to successfully parry).
6 Give copious +2 bonuses for descriptive maneuvers, and for use of terrain (kicking a stool at them, jumping up on a table, using the chandelier or candlestick to parry instead of your sword).