For a long time, it was inconclusive whether Yagura should be played P-66 or S-77 on the 5th move, but in modern Shogi, S-77 is the most popular choice. This is due to the influence of this strategy. The reason is that a P-66 would give Gote a starting point for his attack from P-65.
References
Shintaro Saito, 常識破りの新戦法 矢倉左美濃急戦 基本編
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