I never memorized move sets. Tried a few times as a teenager.
  But I always had a simple strategy: contrarian. That's most of
  it. I ask myself, "What am I expected to do next? Which move can
  I make that they would least expect?" Sometimes I have
  additional criteria with strategy but that's the 'gist' of it
  right there. I don't always do "least expect with most benefit
  to me" because that's in the set of "expected next" moves,
  especially with rational players. I can usually hold my own in
  several matches. win-some, lose-some. == Played chess in school,
  especially summers. With a computer in the late 80s/early 90s,
  spent more time with Battle Chess and got pretty good at it back
  then, playing with friends as well although I slacked off
  through the years, but any time a game came up, I'd play on
  occasion. ==