Quote Originally Posted by Sarakos View Post
Grapple checks in Pathfinder are a d20 roll plus your Combat Maneuver Bonus (CMB, determined by Strength + BAB) versus the opponent Combat Maneuver Defense (CMD, determined by BAB + Strength + Dexterity + 10). Also if the target doesn't break free of the grapple in the first round the initiator of the grapple gets a +5 bonus to their CMB to maintain a grapple
Actually in general CMD applies anything that increases touch AC but size (size mod instead). Deflection rings, Dodge, insight, etc.