Pathfinder's Rise of the Rolemaster
In it’s essence, Rolemaster combat resolution is pretty straightforward; the attacker rolls d100, adds his characters OB (Offensive Bonus) and subtracts the DB (Defensive Bonus) of his target. He then references the appropriate column for the AT (Armor Type) of the target on the table for the weapon or spell used in the attack for the result of his attempt. There are generally 3 possible results; the target is missed entirely, the target is struck weakly and suffers superficial injury (represented by Concussion Hits damage only) or the target is struck solidly and potentially suffers a serious wound (represented by both concussion hit damage and a Critical). If a critical is inflicted by the attack a second d100 roll is made on the appropriate critical table and any additional concussion hits or other effects are applied.
Example: Markuss Dancis is attacking Taghai ‘One-Ear’ with his broadsword. Markuss has an OB of 61, One-Ear has a DB of 15 and a 17 AT. Markuss’s d100 roll is 49 which results in 95 (49+61-15). On the broadsword attack table a 95 result against an AT of 17 results in 6 concussion hits, a very superficial wound as One-Ear has 95 hits.
Had Markuss rolled a 57 on his attack for a result of 103 or if One-Ear had a 13 AT, the result would have been 8 concussion hits and a slashing critical of ‘A’ severity prompting Markuss to roll a second d100 for the critical resolution. In this alternate example Markuss rolled a 70 for the critical which resulted in a strike near One-Ear’s neck that caused 6 additional hits of damage (14 total hits), stunned him for 3 rounds and for 1 round he cannot parry. If Markuss recognizes his advantage he could end the fight very quickly at this point.