As a verb precalculated
is past tense of precalculate.
As a noun tablebase is
a computerized database that contains precalculated exhaustive analysis of a chess endgame position, typically used by a computer chess engine during play.
tablebase
English
Noun
(
en noun)
(chess) A computerized database that contains precalculated exhaustive analysis of a chess endgame position, typically used by a computer chess engine during play.