Skill: increases your chance to hit, and increases chance of critical hit.
Agility: decreases your opponent's chance to hit, and increases your chance of avoiding a critical hit.
Charisma: increases your chance of getting a double-hit, and decreases your opponent's chance of getting a double-hit.
Armor: absorbs damage when you are hit by your opponent.
Min and Max Damage: the minimum and maximum amount of damage you deal when you hit your opponent.
Critical: your chances of dealing a critical hit when you land a hit. A critical hit deals 2x normal pre-armor damage.
Block: your chances of blocking a hit when your opponent lands a hit against you.
Avoid Critical: your chances of turning a critical from your opponent back into a normal hit.
Honours of destroyer: a pact that decreases the other gladiator's armor value.
#Combat Rounds: the # of times total that an attack phase was begun. basically the # of hits+misses+blocks, discounting double-attacks from charisma. What does the "Even # Rounds" entry do? it performs the simulation without the inherent attacker advantage due to the possibility of an odd # of rounds.

To Hit: your skill / (your skill + opponent's agility) * 100...always round down
Block: straight percentage to block when they land a hit on you
Double-Hit: your cha - their cha (0 if negative)
Min Dmg Absorb: (armor/66) - ((armor-66)/660 + 1)
Max Dmg Absorb: (armor/66) + (armor/660)
Critical Hit Chance: your critical hit % - their critical avoid %
Critical Min Damage: min damage (pre-armor absorb damage) * 2
Critical Max Damage: max damage (pre-armor absorb damage) * 2
#Combat Rounds: random# between 9 and 27
Honours of destroyer: armor value decreases by: ((your lvl + their lvl) / 20) * 100