Short answers, pulled from the story.
Pegasus was a gaming magazine published by Judges Guild from 1981 to 1983. Each issue bundled a 32-page roleplaying game supplement with articles on rules variants, monster statistics, gamemastering advice, fiction, and reviews.
Twelve issues of Pegasus were published. A thirteenth issue was sent to the printers but never released before Judges Guild ceased production altogether.
Pegasus covered twelve game systems, including D&D, RuneQuest, Traveller, Tunnels & Trolls, Champions, Stormbringer, Villains and Vigilantes, Arduin Grimoire, The Fantasy Trip, The Morrow Project, Skull & Crossbones, and Ysgarth.
Pegasus had five named editors during its run. Mike Reagan edited the first issue, followed by Chuck Anshell from issue #3, Edward Mortimer from issue #5 in December 1981, Mark Holmer from issue #9 in August/September 1982, and Mike Maddin from issue #12 in February/March 1983.
W. G. Armintrout reviewed the first issue in The Space Gamer No. 44 and called the installment supplement "nearly excellent" while saying he could not recommend the magazine itself. He suggested that AD&D players who valued annual supplements consider subscribing. Perfidious Albion also reviewed Pegasus, with a notice on page 19 of its fifty-first issue in September 1981.
Pegasus #13 was sent to the printers but disappeared and was never published. Judges Guild ceased production of the magazine before that issue reached readers.