Say, you face a challenging opponent, each point is tough. It's unclear whether because of his game/style or because you're not into your own rhythm yet. You're a (weak) 4.0 without many weapons or ways of playing though you could try some variance. Again, each point is tough and you feel like you're on a verge of losing, percentage wise, slow bleeding, should you try to change your game or try harder with the same things you've been doing?? I'm always confused about this decision.