The ranseur and 'disarming'.

[Matthew]

Interesting...so, 20% beginning with number needed to hit opponent AC? As in opponent is wearing chain, a 1st lvl. fighter dices a 15-18 to disarm adversary? I usually rolled a percentile as a separate roll, but I think your reading of the percentile being an aspect or part of the d20 roll is more to the point.

I guess it might well be, hard to say exactly what was intended, but rolling separate percentage dice seems as reasonable as anything else. I would probably make it part of the attack roll, though, probably 17-20 on the die indicating success, or something like that.

[sepulchre]

Forgot about this entirely...

Disarming is a form of non-lethal combat (109 U.A)

Thus, even though armed, one who attempts disarming, will be subject to the ruling governing the three types of non-lethal combat:

If the opponent of a grappling,pummeling or overbearing attack has a weapon, the opponent will always strike first unless the attacker has surprise. Any weapon hit does NO damage, but it does indicate that the attacker trying to grapple, pummel or overbear has been fended or driven off, and the attack is unsuccessful. The weapon-wielder then has the opportunity to strike at the weaponless one "for real", if he or she so chooses. Surprised opponents with weapons have no chance for a fending-off strike, unless the attacker must use all surprise segments to close to grapple, pummel, or overbear (73 Dmg).

As the non-lethal combat ruling appears to give disarming its proper difficulty, I think one could read the PHB disarming example as AC 8 or better. This could certainly make a monk rather formiddable...given that the monk, though unarmed and appearing as a non-lethal combatant, engages in normal (lethal) melee combat as he were armed, i.e open-hand damage, hence his chance to disarm could be ruled as unhindered by the above ruling.