When it comes to modern editions of D&D following the D20 system, many player actions are resolved through what is known as an Ability Check. i.e. the player rolls a twenty-sided die adds his ability score modifier (a bonus or penalty) and compares this to a target Difficulty Class (DC). In earlier editions of the game an Ability Check was popularly carried out by attempting to roll under a characters Ability Score on a d20 but as far as I know this method does not predate (at least) Holmes Basic and possibly later products such as B/X and BECMI D&D. The earliest attempt I can find in regards to crafting some form of OD&D Ability Check dates back to June 1976 and can be attributed to Wesley D. Ives with his article in Dragon #1. However his method is rather complex and not so elegant. The article is never the less worth a read because he sets out some useful descriptions of what sort of tasks are appropriate for each ability score and this is not "sullied" by any ...
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