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Zhuge Liang == Black and Sima Yi == White ?
Historically, the latter has triumphed over the former (says Wikipedia).
I think we'd normally expect White to be given first, and Kongming's reputation was certainly greater than Zhongda's. But when Kongming died, Zhongda was besieging his army. As I recall, it seems that the likeliest story is that Kongming simply died of illness (a story overlaid by superstition because a meteorite was said to have fallen near the Shu army and would obviously have been taken as an omen). The leaderless Shu army then gave up. But the rival emperor wrote something about Kongming losing the battle and fatally vomiting blood. As always, history is written by the victors. Whether any of that provides a clue I know not. But normally problem titles do offer a clue or a description of the starting position.
Other titles in the book relate to the same Three Kingdoms period, and it was around this time that yin-yang first became a "thing", so maybe it was just that Dosetsu had a fascination with that period (the Japanese yo element in the book name being Chinese yang, and his preface includes references to yin.