a) Prediction.* Know the next two or three moves.* No different
  than Chess in that way with one exception: Call them on it but
  be accurate.* Get the timing right.* That just requires basic
  observation of conversation flow.* ("at this point of the
  conversation, what is he/she most likely to say?") b) Know all
  the psychological warfare tricks, especially emotional
  manipulation.* You have to be unflappable. c) Don't mistake
  confusion for emotional upset.* If you get a :/ - it's a genuine
  logical dilemma. d) Patience e) Concede and reveal you're
  playing a different game. There's a few more, but it's lunchtime
  :) They have a certain set of responses for most things.* But
  not everything. Prediction helps because it shakes their
  confidence.* They're not good at managing their emotional states
  very well, and I play with the biological fact that the amygdala
  feeds the reasoning system primarily, and is very weak in the
  opposite direction. Shake the amygdala up a little, a little
  confusion, a little extra grain of frustration, and their logic
  starts tumbling. They're human, not computers.* I'm a drop of
  water on the circuit board; the programmer didn't expect it. I
  argue with them to teach.* I want people to be better than they
  are.* It's genuine from me.* If they want to be the best damned
  logical reasoning brain on the planet, then they'd better be
  ready.* And they're not.