Editing Ogre:CharacterCodex:Movement (section)

==Moving through a Square==
'''Friend:''' You can move through a square occupied by a friendly character, unless you are charging. When you move through a square occupied by a friendly character, that character doesn’t provide you with cover.

'''Opponent:''' You can’t move through a square occupied by an opponent, unless the opponent is helpless. You can move through a square occupied by a helpless opponent without penalty. (Some creatures, particularly very large ones, may present an obstacle even when helpless. In such cases, each square you move through counts as 2 squares.)

'''Ending Your Movement:''' You can’t end your movement in the same square as another creature unless it is helpless.

'''Very Small Creature:''' A Fine, Diminutive, or Tiny creature can move into or through an occupied square. The creature provokes attacks of opportunity when doing so.

'''Square Occupied by Creature Three Sizes Larger or Smaller:''' Any creature can move through a square occupied by a creature three size categories larger than it is.
A big creature can move through a square occupied by a creature three size categories smaller than it is.

'''Designated Exceptions:''' Some creatures break the above rules. A creature that completely fills the squares it occupies cannot be moved past, even with the Tumble skill or similar special abilities.