Focused Sunder( Expanded Psionics Handbook, p. 46)
You can sense the stress points on others' weapons.
To use this feat, you must expend your psionic focus (see the Concentration skill description, page 37). When you strike at an opponent's weapon, you ignore half of the weapon's total hardness (round down). Total hardness includes any magical or psionic enhancements possessed by the weapon that increase its hardness.
You can also sense the stress points in any hard construction, such as wooden doors or stone walls, and can ignore half of the object's total hardness (round down) when attacking that object.