I’ve found five years of D&D to have a similar, and persistent, effect. In the beginning I found it hard to relax and “yes and” what was going on. Fast forward to now, I can be in character in front of random people without a hint of anxiety. It was a completely unexpected side-effect of playing, and I’ve also seen a general increase in creativity as well.
There have been a lot of versions and revisions of D&D over the years. Amongst players of the earlier (or "classic") versions of the game, 'B/X' stands for play based around the Basic Set edited by Tom Moldvay, and the Expert Set edited by "Zeb" Cook, both published in 1981.
The 'B/X' edition of the game came after the "Holmes" boxed set,first published in 1977 and edited by J. Eric Holmes, and before the BECMI (Basic, Expert, Companion, Masters, Immortals) published in 1983 and later (and eventually compiled in the D&D Rules Cyclopedia published in the early '90s). They existed at the same time as Advanced Dungeons & Dragons, which had more, and more complex, rules.
