それは定石だよ。
Sentence Analyzer
English Translation
That's common sense.
Furigana
それは定石 だよ。
Romanji
Sore wa jōseki da yo.
Words
其れ
(それ)
that (indicating an item or person near the listener, the action of the listener, or something on their mind); it; that time; then; there (indicating a place near the listener); you
は
(は)
topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis
定石
(じょうせき)
established tactic; play by the book
だ
(だ)
be; is; indicates past or completed action; indicates light imperative
よ
(よ)
indicates certainty, emphasis, contempt, request, etc.; used when calling out to someone; used to catch one's breath or get someone's attention; yo!