How are the difficulties of called shots determined in Dwarf Fortress adventure mode

dwarf-fortressdwarf-fortress-adventure

In Dwarf Fortress adventure mode called shots (aimed attacks as they're called in the game), have two modifiers.

  • Difficulty (Chance to hit)
    • Easy Strike
    • Tricky Strike
    • Difficult Strike
  • Squareness (Damage Modifier)
    • Can only graze
    • Square
    • Very square

How are these things determined, and can they be manipulated to give me an:

Head Easy Strike, Very Square

Best Answer

Weapon skill is the best way to increase this. I have a legendary +10 swordmaster, and he can make these hits like it's nothing.