If there is a situation in which you aren't sure whether you are required to give up your life, do you give up your life or not?
The most simple example would be if someone doesn't know whether murder is yehareg v'al yaavor, but that situation would probably never come up. I am thinking more about the things that are debated, or if you are unsure about them. For example, the Chafetz Chaim (Nidchei Yisrael ch. 1) lists a few things that are yehareg v'al yaavor that you wouldn't have thought of (e.g. to say you are an idol worshiper even without worshiping idols). In such a case, do you take the stringent or lenient position?