"Although it is coming on 18 years since Deep Blue beat Kasparov, humans are still barely fending off computers at shogi, while we retain some breathing room at Go. ... Ten years ago, each doubling of speed was thought to add 50 Elo points to strength. Now the estimate is closer to 30. Under the double-in-2-years version of Moore's Law, using an average of 50 Elo gained per doubling since Kasparov was beaten, one gets 450 Elo over 18 years, which again checks out. To be sure, the gains in computer chess have come from better algorithms, not just speed, and include nonlinear jumps, so Go should not count on a cushion of (25 – 14)*9 = 99 years."
Fifth edition has a lot to prove following the highly-controversial fourth edition, the rise of competing roleplaying game Pathfinder, and two years of public playtesting. Initial reviews posted on Amazon appear overwhelmingly positive at the time of writing, but more skeptical gamers may wish to take a look at the free "Basic Rules" posted on the official D&D website. The basic rules contain all the bare essentials needed to create a character or run your own adventure, and will serve both as a free introduction for new players and as a holdover for long time players until the remaining two rulebooks are released.