An attacking player calculates "shooting modifiers": a short range or a large target gets +1; a long range, target behind cover, target with a shield, or target engaged in a fight all garner -1. It is possible to get up to +2 by spending that many attack points on "concentration."
An attacking player calculates shooting modifiers: close-range targets or large targets receive a bonus of +1; long-range targets behind cover, targets with shields, or targets engaged in combat get a penalty of -1. It is possible to achieve a maximum bonus of +2 by spending attack points on "concentration."