Originally Posted by
Sarakos
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