The following rules are designed to replace the damage
system introduced in Greyhawk:

For every three levels a Fighter advances, or every four levels
a Thief advances, he may master one additional weapon and
score the increased damage shown on the Expert column. Thieves
are limited to expertise in sword, dagger, a combination of these,
or the sling.

Instead of increasing expertise in one weapon, a Fighter or
Thief with a dexterity of 13 or better may take a combination of
two one-handed weapons. Each combination is unique and must
be clearly recorded. In melee the wielder may strike once with
each weapon or once with either weapon and count as shielded.
No expertise bonus is given when employing this option, even
though the wielder may normally have it for either weapon.

Sword and Sword, or Flail & Morning Star combinations
require a dexterity of 16, as these are especially difficult to
master. Only one Morning Star and/or Flail may be used in a
combination.
 

Weapon	Normal	Expert
Dagger	1-4 points	2-5 points
Hand Axe, Mace	1-4 points	1-6 points
Dwarf Hammer, Military Pick*	1-6 points	1-6 points
Battle Axe*	1-8 points	1-12 points
Sword	1-8 points	1-10 points
Flail***	1-8 points	1-10 points
Morning Star**	1-6 points	1-8 points
Spear, Thrown/Thrust	1-6 points	2-8 points
Spear, Thrust vs. Charge	1-8 points	2-12 points
Spear, Set vs. Charge	1-10 points	2-16 points
Pole Arms****	1-12 points	1-12 points
Halberd***	1-10 points	2-12 points
2-Handed Sword***	2-12 points	3-18 points
Mounted Lance	2-12 points	2-24 points
Pike****	1-12 points	1-12 points
Arrow or Quarrel	1-6 points	1-6 points
Sling Stone	1-4 points	1-6 points

* Weapon requires not less than 4’ of space on each side of
the user.
** Weapon requires not less than 5' of space on each side of 
the user.
*** Weapon requires not less than 6’ of space on each side of
the user
**** Weapon not useable in dungeons as a general rule due to
length

The 2-Handed sword requires a Strength of 16 and a dexterity
of 9.

The Military Pick or the Battle Axe may be wielded in one
hand if Strength is 16 and Dexterity is 9.