From publisher blurb: The B/X Essentials line is a restatement of the classic Basic/Expert fantasy adventure gaming rule set, distilled down to its purest essence and given a fresh, new presentation: Basic and Expert rules seamlessly combined. Streamlined presentation optimised for ease of reference during play. Meticulously researched; a guaranteed 100% accurate rendition of the classic rules of yesteryear. Carefully clarified, ironing out ambiguities in the original rules. This first book lays out the core rules of the game, including: encounters, combat, dungeon and wilderness exploration, seafaring, spell casting, and magical research.