When declaring war, one tactic might be for a player to choose the white flag on the war die to mean "0 war cost", and have no intention of forming an alliance. Normally, an alliance is formed when both players in a war choose the white flag symbol:
If both players chose a white flag, a peaceful alliance is formed
However, the rules clearly state that
Players cannot form an alliance in a 2 player game.
Is it still permitted to choose the white flag symbol to bid 0 during war, knowing full well that an alliance cannot be formed? If yes, what happens if both players choose the white flag? Does that mean that it is a tie of 0, and then standard tiebreaker rules apply?