From the Introduction: This supplement additional combat options for player and non-player characters for use with the Basic Fantasy Role-Playing Game rules. This document contains various optional combat rules. The Game Master must choose which, if any, of these rules apply in his or her game. In order to make these options easier to use, each optional rule has a checkbox beside it. The GM may wish to print a copy of this supplement and mark the checkboxes for the rules he or she has chosen.