Visibility

Visibility is a subsection in the "Special Combat Situations" chapterBasic Set 394
*Attacker cannot see anything
**He attacks at -10 (-6 if he is accustomed to being blind).
*Attacker cannot see his foe, but can see his other surroundings.
**If only the attacker’s foe is invisible, use the rules above, but the attack penalty is only -6.
*Attacker cannot see his foe, but knows his location for sure.
**If the foe is in a single smoke-filled hex or the like, use the rules above, but no Hearing roll is required and the attack penalty is only -4.
B548 gives two options for attack penalties
*Blind, target completely invisible, or in total darkness: -10*
*Cannot see foe: -6, or -4 if you know his location to within 1 yard*
B549 discusses defenses:
*Can’t see attacker: -4,
*a block or parry requires a Hearing-2 roll
There is a disconnect between B394/B548 because the former is still at worst -6 to hit someone completely invisible, with the -10 intended for being unable to see surroundings. But the latter "target completely invisible" implies that target invisibility could cause that.
Common sense would dictate you don't stack the -6 for being blind with the -6 for targeting an invisible foe, but it seems strange that a blind person (who can't see their surroundings) could target an invisible foe just as competently as someone who could see their surrounding. 
That's remedied if their location is known to within 1 yard, but how would you even target someone if you didn't know what hex they were in?
==References==
Category:Rules