Player's Option: Combat & Tactics is a supplement presenting upgrades and refinements for the combat system of AD&D. Combat & Tactics uses battle maps with 1-inch square grids to keep track of movement in combat. Combat & Tactics uses melee scale as a default for close range combats, in which one square represents a 5-foot square area, and missile scale for outdoor and long-distance combats, in which one square equals a 5-yard area; the Dungeon Master alternates between these two scales depending on the circumstances of the encounter. The weapon proficiency rules have been changed so that player characters can use any weapon they want, if they pay one or more extra proficiency slots. Combat & Tactics breaks the combat round into phases consisting of multiple steps, including initiative and actions.