(slang) on a particular topic.
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(chess, slang) Extremely knowledgeable in a particular opening as a result of intensive study.
This line is not by any stretch of the imagination considered a critical line, but it does take the players out of mainstream theory, where Giri typically is hardcore booked up.
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Add your own interpretation of "booked up".
Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
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