How would you explain THAC0 to somebody who never played before 3rd edition?

One thought on “How would you explain THAC0 to somebody who never played before 3rd edition?

  1. D. Walker says:

    THAC0 was the Benjamin-Franklin-establishing-the-positive-and-negative-charges-of-electricity of D&D:

    It made sense at the time, but with hindsight proved totally backwards.

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