Meaning of in book | Babel Free

Definitions

Of a chess player: following a main line ("a standard sequence of opening moves considered to be best play").

uncommon

Examples

“The Sicilian opening was wild, but the speed of play made it clear both players were "in book", up to a point.”

“Wesley So had prepared a line with a temporary pawn sacrifice against Praggnanandhaa and both players appeared to be in book for a long time.”

CEFR level