code: def evaluate(grid):
      "Return the value for the player to move, assuming perfect play."
      if is_won(grid): return -1
      succs = successors(grid)
      return -min(map(evaluate, succs)) if succs else f evaluate(grid):
      "Return the value for the player to move, assuming perfect play."
      if is_won(grid): return -1
      succs = successors(grid)
      return -min(map(evaluate, succs)) if succs else 0
docs: Return the value for the player to move, assuming perfect play.