in book

English

Prepositional phrase

in book

  1. (chess, uncommon) Of a chess player: following a main line ("a standard sequence of opening moves considered to be best play").
    Antonym: out of book
    • 2022 January 21, Colin McGourty, “Tata Steel 5: Rapport & Mamedyarov hit the front”, in chess24‎, archived from the original on 2022-05-19:
      The Sicilian opening was wild, but the speed of play made it clear both players were "in book", up to a point.
    • 2023 January 19, Mark Crowther, “Giri overtakes Abdusattorov in a dramatic final round of the Tata Steel Masters to grab his first title”, in The Week in Chess‎, archived from the original on 2023-02-01:
      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.
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