Assertion: chess engine | /r/CapableOf | use vast computed opening book
Facets:
value: often
type: TEMPORAL
value: to increase its playing strength
type: PURPOSE
value: previously
type: TEMPORAL
Source sentences:
text: A chess engine often uses a vast previously computed opening "book" to increase its playing strength for the first several moves up to possibly 20 moves or more in deeply analyzed lines.[citation needed]