Arm Lock

==basics==
B230 introduces. Initially, buying it up as a technique above its prerequisite skill only applied to making it as an attack, either following a successful parry or grapple.
B403 rules:
:a cumulative -1 on future attempts to break free
:The rolls to inflict damage are completely passive and do not count as attacks
==martial==
MA65 calls it "Arm or Wrist Lock" and now, as an ADDED benefit, if it has been bought up as a technique, that can be substituted in the Quick Contest to determine damage.
==Technical Grappling==
TG38 calls it "Arm or Hand Lock" specifying arm = "elbow and shoulder" while hand = "fingers, hand and wrist". It is a single technique but there are different cripple thresholds depending on what is targeted.
TG nerfed them by REQUIRING a grapple, instead of allowing a free attack after a parry. This nerf wasn't done to Judo Throw except as an optional rule! On the plus side, there is no longer a hit location penalty!
This applies Control Points, like using Improve. CP must be spent to allow pain or injury (actually crushing damage) via a contest each following second.
Failing a defense against Break Free unlocks a joint, requiring another successful attack where a defense fails against it.
==Active defenses==
B403 and MA65:
:defends at -4 in addition to any penalties due to injury caused by the lock itself
This is not reiterated (affirmed or denied) in GURPS Martial Arts: Technical Grappling so it's unclear whether it's still meant to be in effect.
==quotes==
Kromm in 2018 http://forums.sjgames.com/showpost.php?p=2216731&postcount=11
I'd let a Judo parry vs. an arm or a weapon set up an Arm Lock even if the target of that arm or weapon was the foot, leg, or groin; such a parry involves the judoka's hands (because Judo doesn't include leg and foot parries), so those are now close to the attacking limb. If it seems like a (literal) reach, put that optional -2 on the parry . . . but if the parry works anyway, Arm Lock follows normally.
I'd say that a Judo parry vs. an attack with the knee, shin, or foot can't set up an Arm Lock but can set up a Leg Grapple. Note that Leg Grapple doesn't work on attacks vs. the groin, leg, or foot . . .
Douglas Cole in 2018 http://forums.sjgames.com/showthread.php?t=160324
ericthered: his torso remains grappled? I don't loose inflicting a -4 penalty on him? or does the grapple shift to the arm?
DC: I’d say that a two handed grapple shifts to the arms, but a one handed armlock, which might represent wrapping one arm around the elbow to do an arm bar or shoulder lock would still leave the other arm available To keep grabbing the torso.
==See also==
*Locks, Throws, Damage, and Multiple Attacks
*Throws from Locks
Category:Techniques