Hayanaratna 3.102

Mercury is at fourteen degrees, in its own hadda (a planet's own small part of a sign). The Moon is in Cancer, at nine degrees. When the three are in ithasala (planets moving toward an exact aspect), the kambula (the Moon supporting the link of two planets) is called best-middle. In the question, know the result to be like its name.

Simple meaning: Best-middle kambula example, part 2: Mercury at 14 in its own small part, Moon in Cancer at 9. The result matches the name.