While engaging in the almost Talmudic study of the original LBBs that is commonplace amongst the old schoolers, I came across the above. Since I harbor the belief that B/X is nothing more than a cleaned up set of the LBBs, I figured this bit of Greyhawk is suitable for adaptation into Moldvay/Cook/Marsh.
As it stands in B/X, the benefits for a high Dexterity are a -1 to AC for a Dex of 13-15, -2 for a score of 16-17, and a -3 for those with a prodigious Dexterity of 18. In assuming the above rule and modifying it conform to B/X; Fighters would gain the following bonus to Armor Class:
Armor Class Modifier
The additional benefit of an extremely high Dexterity (17-18) are still minor enough to adhere to B/X’s attitudes of “working class heroes,” but it gives the Fighter a little something extra to spice up their ill-perceived banality. Although the argument could be made that Thieves, who live and die by their manual dexterity, should also benefit from the above table, I take the word “parry” (which implies a certain puissance of arms) as an excuse to apply the benefits solely to the fighting man.
This house rule shall be added to splintered shields and multiple attacks when opponents are slain in regards to any and all future fighters who deign to enter the halls of Stonehell.