message: Typo in Variable name: pi1 --> pi
  __pi1__ is an undefined name in this context.    Discovered via
diff: @@ -133,7 +133,7 @@ class TestPreprocessing(test_utils.MiniGoUnitTest):
  return sym
  assert False, "No rotation makes {} equal {}".format(
  - pi1.reshape((go.N, go.N)), pi2((go.N, go.N)))
  + pi.reshape((go.N, go.N)), pi2((go.N, go.N)))
  def x_and_pi_same(run_a, run_b):
  x_a, pi_a, values_a = zip(*run_a)
  