Within 1 yard

The within 1 yard rule is found on B548 under visibility modifiers for Melee Combat.
It is merely -4 instead of the usual -6 for being unable to see a foe.
Both are asterisked so "adjusted skill after all modifiers cannot exceed 9" applies, basically a form of Wild Swing.
The cannot see foe penalty is usually lower than the cannot see anything penalty.
This kind of implies can only see foe would be -4.
The used to blindness rule lessens the -10 for "anything" to "-6" (merely can't see foe) strangely.
category:rules