out of book
Resembling lava; in the form of lava.
Third-person singular simple present indicative form of octavate
(psychology) The psychology of human nature as modified by historical change
(chess) No longer following commonly played theoretical lines analyzed in opening books; in territory unfamiliar to one or both of the players.
対局はすぐに序盤の定跡から外れ、両者はその場での判断に頼らざるを得なかった。
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