You must ensure that your response rule is credible, namely that if and when the time comes for you to make the stated response, you will actually choose it. This may require changing the game in some way to ensure that the choice is in fact best for you in that situation. But in the game that follows, you must then have the second move so you will have the ability to respond to the other’s choice. This may require you to restructure the order of moves in the game, and that adds its own difficulties to your making the strategic move.
