# Attack of Opportunity
# Melee touch attack
# Opposed grapple check:
BAB + Str mod. + Special Size mod.
Special Size mod.: +4 for each size category (medium=+0)
Cannot grapple opponent two categories larger.
If lost, then grapple start fails
# maintaining grapple:
must move into target's space. (free action)
moving provokes AoO from nearby opponent (not from
targets)
if unable to move into target, grappling fails
# Grappling>
you threaten no squares
you lose dex bonus
you may not move (unless opposed grapple check)
* while grappling, you may:
** activate magic item in place of attack
** attack opponent: unarmed strike, natural or light weapon. -4 attack penalty, may not attack with 2 wpns.
** cast a spell: <= 1standard action, no somatic components, spell components must be in hand,
must make Concentration DC 20 + spell level
** damage opponent> make opposed grapple checks
and deal nonlethal dmg 1d3 for medium,
May take -4 penalty on grapple to deal lethal dmg.
(monks automatically deal lethal dmg w/o -4 penalty)
** draw lite weapon as move action, must make grapple 
check
** escape from grapple:
  *** must win opposed grapple check instead of attack
  *** or may make Escape Artist as std. action
  *** must beat all grapple checks when grappled
  by multiple opponents
  *** successful escape moves you to adjacent square
** move 1/2speed on successful grapple check
  +4 bonus on grapple check to move a pinned opponent
  when only 2 creatures in grapple
** retrieve spell component on successful grapple check
  fullround action
** pin opponent (hold immobile for 1 rd.) on successfule
  graple check instead of attack
***pinned opponents:
  ****damage opponent w/opposed grapple check
  ****move the grapple
  ****use his weapon
  ****prevent from speaking
  ****disarm/grab secured object: he gets +4
  bonus on disarm resist
  ****release pin and grapple as free action
  ****CANNOT draw/use weapon
  ****CANNOT escape another's grapple
  ****CANNOT retrieve spell component
  ****CANNOT pin another character
  ****CANNOT break another's pin
***being pinned
  **** you are immobile, but not helpless
  **** -4 to AC against other oppoents
  **** may escape pin (but not grapple) by opposed grapple instead attack
  **** or make Escape artist as std. action
** break another's pin: if grappling an
  opponent who has 3rd character pinned,
  may break the hold on 3rd character on
  successfule grapple check. 3d character is grappled
  but not pinned.
** use opponent's weapon:
  if opponent holds light weapon, make opposed grapple
  check instead of attack. Then make attack roll
  with his wpn with -4 penalty (attack is free action)
  you don't gain the weapon
*** multiple creatures in grapple
  ** target doesn't take AoO
  ** attack is autosuccessful
  ** must make opposed grapple check to start grapple
  ** <4 combatants on 1 (1size or smaller=1/2, 1size
  or larger=2x; two or more = 4x)
  ** to escape must beat check results of each opponent
-------------------
TRIP
# may trip opponent 1cat smaller/larger
# make unarmed melee touch attack
# get AoO for unarmed attack (unless Improved Trip)
# when success, make Str check opposed by Str/Dex check
  +4 bonus for each cat. above medium, -4 below
  +4 bonus when 2+ legs or more stable (e.g. dwarf)
# when failed, opponent may trip you
# tripped character is prone
# dismounting rider: rider may take Ride check
  instead Str/Dex
# with some weapons you make melee touch instead
  unarmed melee touch and don't take AoO
  May drop that wpn to avoid being tripped
  in your own trip attemp.