Player Core Chapter 8: Playing The Game Movement

Cover

When you're behind an obstacle that could block weapons, guard you against explosions, and make you harder to detect, you're behind cover. Standard cover gives you a +2 circumstance bonus to AC, to Reflex saves against area effects, and to Stealth checks to Hide, Sneak, or otherwise avoid detection. You can increase this to greater cover using the Take Cover basic action, increasing the circumstance bonus to +4. If cover is especially light, typically when it's provided by a creature, you have lesser cover, which grants a +1 circumstance bonus to AC. A creature with standard cover or greater cover can attempt to use Stealth to Hide, but lesser cover isn't sufficient.

Cover is relative, so you might simultaneously have cover against one creature and not another. Cover applies only if your path to the target is partially blocked. If a creature is entirely behind a wall or the like, you don't have line of effect and typically can't target it at all.

Usually, the GM can quickly decide whether your target has cover. If you're uncertain or need to be more precise, draw a line from the center of your space to the center of the target's space. If that line passes through any terrain or object that would block the effect, the target has standard cover (or greater cover if the obstruction is extreme or the target has Taken Cover). If the line passes through a creature instead, the target has lesser cover. When measuring cover against an area effect, draw the line from the effect's point of origin to the center of the creature's space. See the diagram for examples.

Dae and the tashtari don't have any cover from one another. The line from the center of Dae's space to the center of the tashtari's space doesn't pass through blocking terrain or other creatures.
The tashtari and Chk Chk have lesser cover from one another. The line between the centers of their spaces doesn't pass through any blocking terrain, but does pass through Dae's space.
The tashtari and Iseph have cover from one another. The line between the centers of their spaces crosses blocking terrain.
Navasi and the tashtari can barely see one another, but have cover from one another because the line between the centers of their spaces goes through blocking terrain. Because there's so much blocking terrain in the way, the GM will likely rule this is greater cover.

Cover and Large Creatures

Source Player Core pg. 416

If a creature between you and a target is two or more sizes larger than both you and your target, that creature's space blocks the effect enough to provide standard cover instead of lesser cover. The GM might determine that a creature doesn't gain cover from terrain that it's significantly larger than. For example, a Huge robot probably wouldn't receive any benefit from being behind a 1-foot-wide pillar.

Special Circumstances

Source Player Core pg. 416

Your GM might allow you to overcome your target's cover in some situations. If you're right next to a narrow window, you can shoot without penalty, but you have greater cover against someone shooting back at you from far away. Your GM might let you reduce or negate cover by leaning around a corner to shoot or the like. This usually takes an action to set up, and the GM might measure cover from an edge or corner of your space instead of your center.

Type of Cover	Bonus	Can Hide
Lesser	+1 to AC	No
Standard	+2 to AC, Reflex, Stealth	Yes
Greater	+4 to AC, Reflex, Stealth	Yes

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