Slave 1 gets +2 power as long as it's attacking a Jedi. Accuracy 2 (Add +2 to each of this unit_s attack dice. Accuracy is cumulative and its result is not considered 'natural').
Keywords
Accuracy
Accuracy X/-X: A cumulative, static ability that means, "Add X to each of this unit’s attack dice." and "Subtract X from each of this unit’s attack dice." respectively. Accuracy can’t alter "natural" rolls to affect Critical Hit, Fury, or Parry, but it can affect your chance against Armor. If a unit gets the Accuracy ability after you roll attack dice, it's too late to affect the hits.