noun
main tournament; final rounds; finals
Refers to the main competition after preliminary rounds or qualifying stages. Used in sports, contests, and tournaments.
彼は予選を勝ち抜いて本戦に進んだ。
He won through the qualifiers and advanced to the main tournament.
本戦は来週の土曜日から始まります。
The finals start next Saturday.
Compound of 本 (main, real) and 戦 (battle, match). The alternate form 本選 uses 選 (selection).