small side gate
閤 refers to a small side gate, a secondary entrance distinct from the main gate.
閤 combines 門 (gate) with 合 (join, fit), suggesting a gate that is joined or attached to a main structure, hence a side gate.
Inside the gate 門, the component 合 (join) suggests a small gate joined to the side of a larger gate or wall.
For コウ, imagine a small side gate that leads to a cozy courtyard: cozy gate -> コウ.
taikō (esp. Toyotomi Hideyoshi); title for a regent, later for the grand chancellor, also for the father of an Imperial adviser (advisor) who passed the role to his son
Toyotomi Hideyoshi's nationwide land survey (1582)
mirror go (as black); opening strategy of symmetrically copying every move of the opponent, starting with tengen
Toyotomi Hideyoshi
sleeping quarters; bedroom