"B1" (Intermediate) is the third level, as defined by the European Common Framework, which is used on this Chinese Pronunciation Wiki. It is roughly equivalent to HSK Level 3. For more information on the levels used here, see the Pronunciation Points by Level page. There are 5 total pronunciation points in the list below.
||You won't find these in our chart, but if you're an intermediate learner, it's time to let you in on the little secret of these syllables' existence.