No, not 3 wrong, but only 3 right. I was effectively doing a blinded test. Since I didn't know what are the real differences between the two fonts, all I could

No, not 3 wrong, but only 3 right. I was effectively doing a blinded test. Since I didn't know what are the real differences between the two fonts, all I could do --- as another user has commented --- was to make consistent choices throughout the whole test. Actually I think a blinded test is slightly more meaningful, because the test hypothesis looks simpler.