Power Score is how well someone made or did not make a skill roll. when using a power score it is normal power score verses power score to see who wins.
Interestingly you gain 1 point of Experience for every 30 points of your power score. Critical successes increase your power score by the appropriate multiplier
Joe has an observation skill of 65% he is attempting to spot two hidden bandits, the first bandit made his hide roll by 5 and the second made his by 20 meaning that Joe has a difficulty of 5 to spot the first bandit and 20 for the second bandit,
Since his skill is 65 and we take the 5 away that means he has to roll 60 or less on a 1d100 for the first bandit and must roll 45 or less to see both.
He rolls 48 and only sees the first bandit.
Joe is now attacking the first bandit with his bow, his skill is 75, he takes aim and releases the arrow his roll is 17 so his power score is 58. meaning that the bandit has a difficulty to dodging the attack of 58.
Joe enters a forest glade he startles a goblin who promptly attacks, luckly for joe the Goblin has a weapon skill of 30 and rolls a 97 failing the attack by 67 this would mean that Joes dodge skill 50 would be considered 117 for him not to be hit, but the goblin rolled a 97 making it a critical failure so the GM rolls a d100 and compares it to the Critical Failure table this time he rolls another bad roll 96, meaning that the x5 multipler on the 67 brings the modifier to 335.
This means joe has to roll below 385 to dodge on a d100 he rolls 3 giving him a power score of 382 but it is a critical success his second roll is 95 giving him a x5 multiplier finishing his power score to be 1,910. since you get 1 experence for each 30 points of your power score he gains 63 experence